Magneto-optic Patents (Class 359/280)
  • Patent number: 11422511
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: August 23, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh, Masatoshi Nishida
  • Patent number: 11125925
    Abstract: To provide a volume-type optical element in which a self-cloning photonic crystal is used. An optical element is provided with half-wave plates of photonic crystals formed on the xy plane and laminated in the z-axis direction in a three-dimensional space x, y, z. The groove direction of the photonic crystals is a curved line, and the angle in relation to the y-axis direction changes continuously in the range of 0°-180°. Light entering the optical element in the axial direction is emitted from the optical element upon being divided and converted into clockwise circularly polarized light in the direction facing the x-axis by a given angle from the z-axis and anticlockwise circularly polarized light in the direction facing the ?x-axis by a given angle from the z-axis. Laminating or placing a quarter-wave plate comprising a photonic crystal on one or both surfaces makes it possible to divide light entering from the z-axis direction of the optical element into two orthogonal linearly polarized lights.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: September 21, 2021
    Assignees: Photonic Lattice, Inc., Sophia School Corporation, Keio University
    Inventors: Shojiro Kawakami, Takayuki Kawashima, Takafumi Chiba, Toshikazu Ijiro, Hiroyuki Tsuda, Hiroshi Takahashi
  • Patent number: 11079545
    Abstract: An electromagnetic radiation beam is inputted into a ring interferometer rotating at the angular velocity ? where the beam is split into two equally intensive counter—propagating electromagnetic beams. The Sagnac Effect results in the phase shift of ±Pi/2 radians, which may be either positive or negative depending on the direction in which the counter-propagating electromagnetic radiation beams propagate with regard to the rotation direction of the ring interferometer. An additionally phase shift of Pi/2 radians is induced between the counter-propagating electromagnetic radiation beams inside the ring interferometer results in a total phase shift of either Pi radians or 0. The counter-propagating electromagnetic radiation beams inside the ring interferometer are then combined into one single electromagnetic radiation (EMR) beam which outputted from the rotating ring interferometer by using a different path than the one through which the EMR beam is inputted into it.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: August 3, 2021
    Assignee: UAB “ATZALAS”
    Inventor: Kestutis Regelskis
  • Patent number: 10909900
    Abstract: A display substrate, a display device and a display control method are provided. The display substrate comprises a plurality of pixel units. Each of the plurality of pixel units includes a first region and a second region which is switchable between a non-opaque status and an opaque status. The first region comprises a first light-emitting unit which is a single-sided light-emitting unit. The second region includes at least one color-variable component covering the second region. Each of the at least one color-variable component is switchable between a transparent status and a non-transparent status. The second region is in the non-opaque status in a condition that the at least one color-variable component is in a transparent status. The second region is in the opaque status in a condition that the at least one color-variable component is in a non-transparent status.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: February 2, 2021
    Assignees: HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Mengyu Luan, Zhongsheng Qi, Bo Mao, Youyuan Hu, Lang Liu
  • Patent number: 10739602
    Abstract: A segmented chromatic phase plate includes at least three stacks. The three stacks are arranged around and stacked along a main axis, and have same overall heights. Each stack includes at least two plane-parallel optical flats of different materials. The materials and the thicknesses of the optical flats are selected such that optical path lengths of light of a first wavelength passing through the different stacks along the main axis differ by integer multiples of the first wavelength, whereas optical path lengths of light of a second wavelength differ by integer multiples plus defined fractions of the second wavelength. The materials of the at least two optical flats have different refractive indices for both the first and second wavelengths; and derivatives of the differences between the optical path lengths with respect to wavelength are zero at at least one of the first and second wavelengths.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: August 11, 2020
    Assignee: DEUTSCHES KREBSFORSCHUNGSZENTRUM
    Inventor: Johann Engelhardt
  • Patent number: 10706811
    Abstract: A method for controlling display of a flexible display screen includes: traversing distance sensors in each detection sequence according to a sequence of the detection sequence, each being a target sensor, and obtaining a front adjacent sensor in front of the target sensor and a rear adjacent sensor in rear of the target sensor in the detection sequence; obtaining a corresponding proximity distance of the target sensor, the front adjacent sensor, and the rear adjacent sensor; when the proximity distance of the target sensor is less than the proximity distance of the front adjacent sensor, and is less than or equal to the proximity distance of the rear adjacent sensor, determining an unfolded position according to the target sensor; and ending the traversal; determining a visible area of the flexible display screen according to the unfolded position, and displaying a corresponding display content on the visible area.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: July 7, 2020
    Assignee: SHENZHEN ROYOLE TECHNOLOGIES CO., LTD.
    Inventor: Xuan Zhang
  • Patent number: 10693274
    Abstract: A multi-wavelength single-frequency optical fiber laser source for a laser radar system includes a resonant cavity composed of a high-reflectivity chirped optical fiber grating, a high gain optical fiber and a low-reflectivity chirped optical fiber grating, a single-mode semiconductor pump laser served as a pump light source, an optical wavelength division multiplexer, an optical coupler, an optical isolator, an optical circulator, an optical filter module, and a semiconductor optical amplifier. The pump light source performs optical fiber core pumping with respect to the high gain optical fiber. A portion of the wide-spectrum laser is filtered by the optical filter module to obtain a wavelength corresponding to a specific central frequency. Multi-wavelength laser lasing with a narrow linewidth and single longitudinal mode is implemented by combining a short linear resonant cavity structure and the optical filter module.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: June 23, 2020
    Assignee: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
    Inventors: Shanhui Xu, Zhongmin Yang, Yuning Zhang, Zhouming Feng, Changsheng Yang
  • Patent number: 10033078
    Abstract: The present disclosure relates to a tunable magnonic crystal device comprising a spin wave waveguide, a magnonic crystal structure in or on the spin wave waveguide, and a magneto-electric cell operably connected to the magnonic crystal structure. The magnonic crystal structure is adapted for selectively filtering a spin wave spectral component of a spin wave propagating through the spin wave waveguide so as to provide a filtered spin wave. The magneto-electric cell comprises an electrode for receiving a control voltage, and adjusting the control voltage controls a spectral parameter of the spectral component of the spin wave via an interaction, dependent on the control voltage, between the magneto-electric cell and a magnetic property of the magnonic crystal structure.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: July 24, 2018
    Assignees: IMEC VZW, Katholieke Universiteit Leuven, KU LEUVEN R&D
    Inventors: Florin Ciubotaru, Hanns Christoph Adelmann, Xiao Sun
  • Patent number: 9847356
    Abstract: An array substrate, a display apparatus applying the same and the assembly method thereof are provided, wherein the array substrate includes a substrate having a plurality of pixels, each of the pixels at least includes a thin film transistor (TFT) device, a first electrode, a second electrode separated from the first electrode all of which are disposed on the substrate. at least one of the first electrode and the second electrode is electrically contacted to the TFT device, and either the first electrode or the second electrode has a magnetic force generator used to generate a magnetic force substantially ranging from 10 gauss to 1000 gauss.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: December 19, 2017
    Assignee: INNOLUX CORPORATION
    Inventors: Jen-Chien Peng, Chia-Hao Tsai, Tsau-Hua Hsieh
  • Patent number: 9362460
    Abstract: The invention is directed to an integrated polarized light emitting diode device that has a light emitting diode, a metal grating, an oxide layer, and a built-in photonic crystal rotator. Additional teachings include a method for making the integrated polarized light emitting diode, a method for improving the polarization selectivity and energy efficiency of a light emitting diode, and a method for rotating polarization of a light emitting diode.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: June 7, 2016
    Assignee: RENSSELAER POLYTECHNIC INSTITUTE
    Inventors: Shawn-Yu Lin, Yong Sung Kim, Mei-Li Hsieh
  • Patent number: 9330878
    Abstract: An electro-mechanical x-ray generator configured to obtain high-energy operation with favorable energy-weight scaling. The electro-mechanical x-ray generator may include a pair of capacitor plates. The capacitor plates may be charged to a predefined voltage and may be separated to generate higher voltages on the order of hundreds of kV in the AK gap. The high voltage may be generated in a vacuum tube.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: May 3, 2016
    Assignee: Los Alamos National Security, LLC.
    Inventors: Scott A Watson, David Platts, Eric B Sorensen
  • Patent number: 8891167
    Abstract: Provided is a polarization independent optical isolator including: wedge-shaped birefringent crystal plates each made of a LiNbO3 single crystal; a Faraday rotator 3 made of a magnetic garnet single crystal; and sapphire single crystal plates 2 and 4 bonded to light transmitting surfaces of the Faraday rotator, respectively. A light transmitting surface of each of the sapphire single crystal plates is formed in such a manner as to be offset from the c-plane of the sapphire single crystal plate. An incident angle ?a of imaginary light 300 on each of the sapphire single crystal plates, and an offset angles ?off of the light transmitting surface from the c-plane of each sapphire single crystal plates are set within predetermined ranges, the imaginary light 300 being represented by a bisector of an angle formed by optical axes of the ordinary ray and the extraordinary ray.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: November 18, 2014
    Assignee: SMM Precision Co., Ltd.
    Inventor: Junji Iida
  • Patent number: 8879138
    Abstract: A surface plasmon polariton modulator capable of locally varying a physical property of a dielectric material to control a surface plasmon polariton. The surface plasmon polariton modulator includes a dielectric layer, including first and second dielectric portions, which is interposed between two metal layers. The second dielectric portion has a refractive index which varies with an electric field, a magnetic field, heat, a sound wave, or a chemical and/or biological operation applied thereto. The surface plasmon polariton modulator is configured to control one of an advancing direction, an intensity, a phase, or the like of a surface plasmon using an electric signal. The surface plasmon polariton modulator can operate as a surface plasmon polariton multiplexer or a surface plasmon polariton demultiplexer.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: November 4, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hwansoo Suh, Chang-won Lee, Yeon-sang Park, Jineun Kim
  • Patent number: 8854715
    Abstract: A magnetic field may be applied to a plasmon path to affect plasmon propagation.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: October 7, 2014
    Inventors: Jeffrey A. Bowers, Peter L. Hagelstein, Roderick A. Hyde, Muriel Y. Ishikawa, Jordin T. Kare, Clarence T. Tegreene, Lowell L. Wood, Jr., Victoria Y. H. Wood
  • Patent number: 8843000
    Abstract: An optical fiber transmission system includes a light emitting source, a plurality of light receiving terminals, and a plurality of optical fibers connecting the light emitting source to the light receiving terminals. The optical fiber transmission system further includes a plurality of controlling modules positioned between the light receiving terminals and the optical fibers. Each of the plurality of controlling modules includes a controller, a signal analyzer, and a reflective member. The signal analyzer and the reflective member are connected to the controller and analyze and reflect optical signals respectively.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: September 23, 2014
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Yi-Zhong Sheu
  • Publication number: 20140253986
    Abstract: Submitted is an image photography play method which is suited to playing a stereoscopic video. The image photography method comprises: a step of forming a hologram pattern from a reference light and a subject light; a step of digitally processing the obtained hologram pattern; a step of writing the digitized hologram pattern as a magnetized vector pattern to a spatial lighting modulator which is formed from a magneto-optical material; and a step of inputting linearly polarized light into the spatial lighting modulator and playing an image according to the digitized hologram pattern.
    Type: Application
    Filed: May 31, 2012
    Publication date: September 11, 2014
    Applicant: NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY
    Inventors: Mitsuteru Inoue, Hiroyuki Takagi
  • Patent number: 8817370
    Abstract: A magnetic circuit for a Faraday rotator capable of suppressing generation of irreversible demagnetization is provided. This magnetic circuit (100, 200, 300, 400, 500, 600, 700, 800, 900) for a Faraday rotator includes a first magnet (2, 202, 302, 702, 802), a second magnet (3, 203, 303, 703, 803) and a third magnet (4, 304, 604, 704, 804, 904), and a first high coercive force region (4b, 304b, 604b, 704b, 904b) is provided in the vicinity of at least the inner peripheral surface of a third through-hole (4a, 304a, 604a, 704a, 804a, 904a) of the third magnet.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: August 26, 2014
    Assignee: Hitachi Metals, Ltd.
    Inventor: Akihiro Kimoto
  • Patent number: 8749871
    Abstract: An optical structure for generating nonreciprocal loss is provided that includes a first substrate layer and a magneto-optical layer positioned on the first substrate layer. The magneto-optical layer achieves nonreciprocity with application of an external magnetic field so as to produce resonantly enhanced nonreciprocal loss.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: June 10, 2014
    Assignee: Massachusetts Institute of Technology
    Inventors: Juan C. Montoya, Steven J. Spector, Reuel Swint, Caroline A. Ross
  • Publication number: 20140103919
    Abstract: A magneto-optic surface includes a support; at least two moving elements; each of the moving elements including at least one anchoring point to the support and at least one moving part movable with respect to the support, the moving part including at least one magnetic part; the support and the moving elements being laid out in such a way that under the effect of an external magnetic field, at least one of the moving elements moves with respect to the support such that the optical properties of the magneto-optic surface are modified.
    Type: Application
    Filed: October 14, 2013
    Publication date: April 17, 2014
    Inventors: Helene JOISTEN, Bernard DIENY, Philippe SABON, Roberto CALEMCZUK
  • Publication number: 20130314762
    Abstract: A display device includes a flexible display panel with a magnetic pattern, the magnetic pattern including a magnetic substance, a magnetic sensor configured to recognize magnetism of the magnetic pattern and to sense a display area of the flexible display panel in accordance with the magnetic pattern, the display area being variable in a first direction, and a controller connected to the magnetic sensor and to the flexible display panel, the controller being configured to display on the flexible display panel an image corresponding to the display area of the flexible display panel sensed by the magnetic sensor.
    Type: Application
    Filed: March 14, 2013
    Publication date: November 28, 2013
    Inventors: Jun-Ho KWACK, Young-Sik KIM
  • Patent number: 8478082
    Abstract: A fiber-based, magneto-optic (MO) optical modulator or switch based on Sagnac interferometry is provided. The system uses a magneto-optic Faraday rotator (MOFR) to produce optical modulation with low magnetic fields. The Sagnac geometry allows for increased modulation at lower fields than traditional MO modulators. This switch uses the MOFR to create different states of polarization in counter-propagating waves, which results in interference at the output port. A magnetic field is used to control the amount of rotation in the state of polarization (SOP), and therefore, the ON-OFF extinction ratio.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: July 2, 2013
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Sasha N. Kemmet, Jin-Wei Tioh, Mani Mina, Robert J. Weber
  • Publication number: 20130155483
    Abstract: The present disclosure provides an optical fiber free space isolator. The optical fiber free space isolator can be used with various laser devices, and includes a magnetic support and an optical subassembly. The magnetic support is mounted at the output port of a laser device, and the optical subassembly is fixed to the magnetic support. The optical subassembly may be housed in a U-shaped slot formed in the magnetic support. The present invention further includes an assembly method for the optical fiber free space isolator.
    Type: Application
    Filed: January 3, 2012
    Publication date: June 20, 2013
    Inventors: Near MARGALIT, Leo Ye
  • Publication number: 20130146788
    Abstract: Compositions and methods wherein ordered structures of photonic nanocrystals are created in a liquid medium and then such structures are fixed by converting the liquid medium to a solid. In addition, compositions and methods of reversibly fixing such structures, so that ordered structures can be reversibly created in a liquid medium, converted to solid, and then converted back to liquid, wherein new ordered structures can be created and again fixed.
    Type: Application
    Filed: April 14, 2010
    Publication date: June 13, 2013
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Yadong Yin, Jianping Ge, Sunghoon Kwon
  • Publication number: 20130141773
    Abstract: A method of amplifying a magneto-optical Kerr effect by using photon crystal structures, and a photon crystal having an amplified magneto-optical Kerr effect, and a method of fabricating the photon crystal. The method of amplifying a magneto-optical Kerr effect by using photon crystal structures includes amplifying the magneto-optical Kerr effect by fabricating a magnetic photon crystal including a crystal magnet and using a periodically-structured surface of the crystal magnet.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 6, 2013
    Applicants: "FACTORY OF NEW MATERIALS" LLC, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Samsung Electronics Co., Ltd., "Factory Of New Materials" LLC
  • Publication number: 20130070327
    Abstract: A structure (10) for rotating a plane of polarization of a polarized visible light signal, including a lower mirror (13) bonded to a top of a substrate (11) with a first bonding layer (12a), a magneto-optic layer (14) disposed on a top of the lower mirror (13), and an upper mirror (15) disposed on a top of the magneto-optic layer (14); wherein when the structure (10) is annealed the first bonding layer (12a) aids adhesion of the lower mirror (13) to the substrate (11).
    Type: Application
    Filed: May 6, 2011
    Publication date: March 21, 2013
    Applicant: PANORAMA SYNERGY LTD.
    Inventor: Roger Dunstan Jeffery
  • Patent number: 8379287
    Abstract: A surface plasmon polariton modulator capable of locally varying a physical property of a dielectric material to control a surface plasmon polariton. The surface plasmon polariton modulator includes a dielectric layer, including first and second dielectric portions, which is interposed between two metal layers. The second dielectric portion has a refractive index which varies with an electric field, a magnetic field, heat, a sound wave, or a chemical and/or biological operation applied thereto. The surface plasmon polariton modulator is configured to control one of an advancing direction, an intensity, a phase, or the like of a surface plasmon using an electric signal. The surface plasmon polariton modulator can operate as a surface plasmon polariton multiplexer or a surface plasmon polariton demultiplexer.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: February 19, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hwansoo Suh, Chang Won Lee, Yeonsang Park, Jineun Kim
  • Patent number: 8373922
    Abstract: A window includes a plurality of transparent substrates spaced apart from each other in a thickness direction; a light transmittance-adjusting layer on a surface of at least one transparent substrate of the plurality of transparent substrates and having a thermochromic or thermotropic characteristic; and an air circulator configured to circulate a heat transfer medium in a space between the plurality of transparent substrates for changing a light transmittance of the light transmittance-adjusting layer.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: February 12, 2013
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Soo-Ho Park, Myung-Gi Shim, Dong-Gun Moon, Mi-Hyun Lee
  • Publication number: 20130032735
    Abstract: A laser apparatus may include: a master oscillator configured to output a pulsed laser beam at a repetition rate; at least one amplifier disposed on a beam path of the pulsed laser beam; at least one optical shutter disposed on the beam path of the pulsed laser beam; and a controller configured to switch the at least one optical shutter.
    Type: Application
    Filed: December 15, 2011
    Publication date: February 7, 2013
    Applicant: GIGAPHOTON INC
    Inventors: Krzysztof Nowak, Osamu Wakabayashi, Hideo Hoshino
  • Patent number: 8294782
    Abstract: An electromagnetic field high speed imaging apparatus, using an image sensing element having a filter function for each pixel, converts a local polarization state in detection light containing a difference frequency component ?f (|fLO?fRF|) between the modulation frequency fLO of irradiated light and the frequency fRF of the electromagnetic field emitted from a subject into local intensity of light, and captures it by an image sensor of an imaging unit to generate a two-dimensional image of distribution of the near electromagnetic field emitted from the subject. Each pixel of the image sensor comprises a photoelectric conversion element for converting the detection light from the optical unit into an electric charge, a plurality of charge storages, and a charge splitting part for dividing the electric charge generated in the photoelectric conversion element between the plurality of charge storages.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: October 23, 2012
    Assignees: Stanley Electric Co., Ltd., National Institute of Information and Communications Technology
    Inventors: Ryohei Ikeno, Masahiro Tsuchiya
  • Publication number: 20120236389
    Abstract: An optical structure for generating nonreciprocal loss is provided that includes a first substrate layer and a magneto-optical layer positioned on the first substrate layer. The magneto-optical layer achieves nonreciprocity with application of an external magnetic field so as to produce resonantly enhanced nonreciprocal loss.
    Type: Application
    Filed: March 7, 2012
    Publication date: September 20, 2012
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Juan C. Montoya, Steven J. Spector, Reuel Swint, Caroline A. Ross
  • Publication number: 20120218619
    Abstract: Provided is an optical body capable of arbitrarily and quickly controlling the optical characteristics of incident light. A refractive index variable layer (8) formed of PLZT or other material and a magneto-optical material layer (9) formed of garnet or other material are provided side by side between a first reflective layer (3) and a second reflective layer (5). If linearly polarized light is made incident from the side of the first reflective layer (3), the incident light interacts with the magneto-optical material layer (9) and is converted into a right-circularly polarized light component and a left-circularly polarized light component. A very small retardation occurring between both the right- and left-circularly polarized light components is amplified through multiple reflections between the pair of reflective layers (3, 5) and is controlled according to a controlled refractive index of the refractive index variable layer (8).
    Type: Application
    Filed: October 4, 2010
    Publication date: August 30, 2012
    Applicant: National University Corporation TOYOHASHI UNIVERSITY OF TECNNOLOGY
    Inventors: Mitsuteru Inoue, Taichi Goto, Takashi Yamaguchi
  • Publication number: 20120207002
    Abstract: A magneto-optical device (MOD) with optically induced magnetization for use in magnetic field sensors as a magnetic element pinning a magnetization in a preferred direction of a ferromagnetic layer as well as a magnetic memory cell for magneto-optical recording. The MOD comprises the Mg—Mg—Co ferrite film deposited on a magnesium oxide (MgO) substrate. The ferrite film is illuminated at room temperature with a circularly polarized light (CPL) in a static magnetic H-field (about of 3 kOe) normal to the illuminated ferrite film surface. At certain (“writing”) combinations of H, sigma (CPL helicity), the long-lived optically induced magnetization with a unidirectional anisotropy, stable to a conventional demagnetization occurs. For readout of information, conventional magnetoresistive sensors and MFM can be used. To erase information, the ferrite film should be illuminated with two field-light combinations, other than “writing”, or annealed at temperature higher than 530 degrees C.
    Type: Application
    Filed: March 28, 2012
    Publication date: August 16, 2012
    Inventors: Esfir Z. Katsnelson, Mark M. Chervinsky
  • Patent number: 8159216
    Abstract: This eddy current imaging method includes the steps of: positioning (72), in the vicinity of a large inspection region, elements for the measurement of a surface magnetic field, generating (74, 92) a global exciting magnetic field over the observation inspection region, measuring (76, 84) a resultant magnetic field at the surface, in the form of images, processing (90) the images. The generating step (74, 82) involves generating a set of at least two exciting magnetic field waveforms; the measuring step (76, 86) involves measuring a set of configurations of the resultant magnetic field in the form of images; the step (90) of treating the images by combining them allows defects to be detected and the position and the nature thereof to be determined.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: April 17, 2012
    Assignee: Centre National de la Recherche Scientifique (C.N.R.S.)
    Inventors: Pierre-Yves Joubert, Yohan Le Diraison, Jean Pinassaud
  • Publication number: 20120057215
    Abstract: A surface plasmon polariton modulator capable of locally varying a physical property of a dielectric material to control a surface plasmon polariton. The surface plasmon polariton modulator includes a dielectric layer, including first and second dielectric portions, which is interposed between two metal layers. The second dielectric portion has a refractive index which varies with an electric field, a magnetic field, heat, a sound wave, or a chemical and/or biological operation applied thereto. The surface plasmon polariton modulator is configured to control one of an advancing direction, an intensity, a phase, or the like of a surface plasmon using an electric signal. The surface plasmon polariton modulator can operate as a surface plasmon polariton multiplexer or a surface plasmon polariton demultiplexer.
    Type: Application
    Filed: April 20, 2011
    Publication date: March 8, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hwansoo SUH, Chang Won LEE, Yeonsang PARK, Jineun KIM
  • Patent number: 8120834
    Abstract: An optical property altering apparatus includes an optical property altering element formed by inductors that are smaller than a wavelength of visible light, mutually connected by connecting lines, and arranged in a single plane; a photoconductor that is excited by incident light and generates alternating current of a frequency identical to that of the incident light; and an amplifying circuit that amplifies the alternating current generated by the photoconductor and supplies the amplified alternating current to the optical property altering element, where the optical property altering element, through supply of the alternating current from the amplifying circuit, arbitrarily alters its refractive index.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: February 21, 2012
    Assignee: Tamron Co., Ltd.
    Inventors: Shunsuke Sasaki, Kazuki Nishizawa
  • Patent number: 8102588
    Abstract: An apparatus, method, system, and computer-program product for producing magneto-optic materials in the blue and green wavelengths. The apparatus includes a substrate generally transparent to a light signal including a component at a predetermined visible frequency; a stack of optical multilayers overlying the substrate for transmitting the component with at least about forty percent power therethrough and having at least about twenty-four degrees of Faraday rotation per micron for the predetermined visible frequency less than about six hundred nanometers. The method includes processes for the manufacture and assembly of the disclosed materials, with the computer program product including machine-executable instructions for carrying out the disclosed methods.
    Type: Grant
    Filed: March 17, 2007
    Date of Patent: January 24, 2012
    Assignee: Panorama Synergy Ltd.
    Inventors: Kamal Alameh, Alex Grishin
  • Patent number: 8094969
    Abstract: A system for numerically modeling evolution of an image propagating through a medium includes image using image data and a propagation medium model. The propagation medium model aligns a propagation centerline of the propagation medium model relative to the center of the image data. The propagation medium model has a numerical operator for applying an index-shifted numerical fractional Fourier transform operation on the image data, and aligning the zero original-domain origin relative to the center of the image data. The image data has spatially-indexed amplitude values and a center located relative to the spatially-indexed amplitude values. The propagation medium model has quadratic phase properties which are defined relative to a propagation centerline of the propagation medium model. Aligning the zero original-domain origin relative to the center of the image data to produces transformed image data having a zero frequency-domain origin that is centered within the transform-domain indices.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: January 10, 2012
    Inventor: Lester F. Ludwig
  • Patent number: 8070919
    Abstract: Provided is a method for preparing a one-dimensional spin photonic crystal device and a one-dimensional spin photonic crystal device prepared by the same. The method comprises forming magnetic and nonmagnetic regions by the interference of laser beams generated from a femtosecond laser light source. The method of the present invention enables production of one-dimensional spin photonic crystals having excellent properties by a rapid and simple process, and is therefore suitable for high integration and large-scale production of desired devices. Further, the prepared photonic crystals exhibit excellent magneto-optical effects and are therefore applicable to development of novel optical devices, and the like.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: December 6, 2011
    Assignee: IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)
    Inventors: Young-Pak Lee, Joo-Yull Rhee, Jin-Bae Kim, Geon-Joon Lee
  • Patent number: 8064129
    Abstract: A process for poling a ferroelectric material doped with a metal, which process comprises: (i) defining an electrode pattern on a ?z face of a crystal of the ferroelectric material doped with the metal; (ii) providing an electrode material; (iii) poling at a temperature of not more than 45° C.; and (iv) poling by a two-stage voltage-controlled application of electric field based on a first poling stage of domain nucleation and a second poling stage of domain spreading.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: November 22, 2011
    Assignee: University of Southampton
    Inventors: Corin Barry Edmund Gawith, Peter George Robin Smith, Huw Edward Major
  • Patent number: 8058869
    Abstract: The device includes two supports and a primary conductive strip. The primary conductive strip includes a neutral surface, a first side, and a second side. The primary conductive strip is connected one of directly and indirectly on the first side to the two supports such that the primary conductive strip is constrained in two dimensions and movable in one dimension. The device also includes a primary distributed feedback fiber laser. The primary distributed feedback fiber laser includes a fiber axis. The primary distributed feedback fiber laser is connected to the primary conductive strip along one of the first side and the second side such that there is a positive distance between the neutral surface of the primary conductive strip and the fiber axis of the primary distributed feedback fiber laser.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: November 15, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Geoff A Cranch, Gordon M. A. Flockhart
  • Patent number: 8059965
    Abstract: Methods and systems for PMD compensation in an optical communication system are implemented by transmitting multiple optical signals through a common optical conduit to an optical compensator that adjustably rotates the polarization states of the multiple optical signals and transmits the rotated optical signals to an optical receiver. The receiver, upon sensing an excessive error condition, commands the optical compensator to change the polarization state of rotation, which changes the PMD profile of the received optical signals.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: November 15, 2011
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Michael Herbert Eiselt, Jonathan A. Nagel
  • Patent number: 8054536
    Abstract: A method of inducing a periodic variation of nonlinearity value in a sample of ferroelectric material comprises arranging a pair of electrodes on opposite faces of the sample, one electrode defining a desired pattern of nonlinearity variation, applying a pre-bias voltage across the sample for a predetermined time using the electrodes, the pre-bias voltage being less than the coercive field of the ferroelectric material; and after the predetermined time, applying a current-controlled poling voltage across the sample using the electrodes, to produce domain inversion in the sample according to the desired pattern of nonlinearity variation. The pre-bias voltage may be 75% of the coercive field or more, and applied for a pre-determined time between 1 and 100 seconds.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: November 8, 2011
    Assignee: University of Southampton
    Inventors: Corin Barry Edmund Gawith, Huw Edward Major, Lu Ming, Peter George Robin Smith
  • Patent number: 8000767
    Abstract: A detector uses the magneto-optical Kerr effect and exploits the transition region between two magnetization states of a magneto-optical film to detect magnetic fields of less than 100 pT. The magnetic field of a subject is determined by examining the polarization of light reflected from the magneto-optical film. A several ?m thick, bismuth doped, YIG film is used for detection as the transition regions are steep, providing large changes in the polarization rotation angle for small variations in the applied magnetic field. The apparatus may be used in the functional imaging of various organs and systems in humans and animals or for the spatial and temporal tracking of nano or micro magnetic particles intentionally introduced into the circulatory or intestinal systems for diagnostic or research purposes.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: August 16, 2011
    Assignee: Board of Trustees of the University of Illinois
    Inventors: J. Gary Eden, Ju Gao
  • Patent number: 7929195
    Abstract: A deformable reflective surface is disclosed that may be used with a retroreflector to provide a modulated retroreflector. The modulated retroreflector may be used in communication systems such as optical laser communication systems wherein an incident beam is reflected back to the source, as modulated by the modulated retroreflector. The deformable reflective surface uniformly reflects or disperses an incident light, depending on a deformation state of the surface. The different states of the deformable reflective surface permits modulation of the reflected beam, based on an input modulation signal that can contain voice or sensor data, for example. A sensor may be used to sense the incident beam and activate the retroreflector. The deformable reflective surface may be arranged to be switched between a diffractive reflective surface and a uniform reflective surface.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: April 19, 2011
    Assignee: Trustees of Boston University
    Inventor: Thomas G. Bifano
  • Patent number: 7924493
    Abstract: A Faraday rotator mirror which is compact, allows high workability of manufacturing and has high reliability and high coupling efficiency is provided. The Faraday rotator mirror comprises a graded-index fiber, a Faraday rotator and a reflector mirror, wherein light incident via the graded-index fiber passes through the Faraday rotator to be reflected on the reflector mirror, and the reflected light passes through the Faraday rotator and emerges through the graded-index fiber.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: April 12, 2011
    Assignee: Kyocera Corporation
    Inventors: Yusuke Takei, Tetsuya Suga, Satoru Tomie, Yasushi Sato, Michifumi Shoda
  • Patent number: 7898720
    Abstract: A Faraday rotator having a magnet member constituted of a first magnet standing magnetized in the direction perpendicular to the optical axis and taken toward the optical axis, a second magnet standing magnetized in the direction perpendicular to the optical axis and taken against the optical axis, and a third magnet disposed between these magnets and standing magnetized in the direction parallel to the optical axis and taken toward the first magnet from the second magnet. A through-hole (hollow spaces) inside which a Faraday element is disposed, is provided through the center of these magnets and, where the length of the first magnet and that of the second magnet in the optical-axis direction are both represented by L2 and the length of the third magnet in the optical-axis direction is represented by L3, the relationship of the following Expression (1) is established: L2/10?L3?L2.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: March 1, 2011
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Nobuo Nakamura, Koichiro Maki
  • Patent number: 7843622
    Abstract: An active optical filter transmits or blocks light according to whether or not a magnetic field is applied, and functions as an optical filter transmitting light having a predetermined wavelength when light is transmitted according to a magnetic field. The active optical filter includes: an optical filter layer for transmitting or blocking light according to whether or not a magnetic field is applied; and a magnetic field applying unit surrounding the optical filter layer for applying a magnetic field to the optical filter layer. The optical filter layer has a multi-layer thin layer structure which is formed of two kinds of thin layers having different respective refractive indices and sequentially and periodically stacked on a substrate.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: November 30, 2010
    Assignees: Samsung Electronics Co., Ltd., Samsung SDI Co., Ltd.
    Inventor: Pil-soo Ahn
  • Publication number: 20100238536
    Abstract: A magneto-optical isolator device is provided. The isolator device includes a substrate and a bottom cladding layer that is formed on the substrate. An optical resonator structure is formed on the bottom cladding layer. The resonator structure includes crystalline or amorphous diamagnetic silicon or silicon-germanium so as to provide non-reciprocal optical isolation. A top cladding layer is formed on the resonator structure. One or more magnetic layers positioned on the top cladding layer or between the top cladding or bottom cladding layers and the optical resonator structure.
    Type: Application
    Filed: March 18, 2009
    Publication date: September 23, 2010
    Inventors: Juejun Hu, Lei Bi, Lionel C. Kimerling, Gerald F. Dionne, Caroline A. Ross
  • Patent number: 7795043
    Abstract: A method of manufacturing oscillator devices each having an oscillator and a resilient supporting member for supporting the oscillator for oscillatory motion, includes a step of processing one and the same substrate to form oscillators and resilient supporting members of oscillator devices so that oscillators of adjacent oscillator devices are connected to each other, a step of forming or placing a magnetic material so that it extends across the connected oscillators of the adjacent oscillator devices, and a step of simultaneously cutting and separating the connected oscillators and the magnetic material formed or placed to extend across the connected oscillators, whereby oscillator devices, such as oscillatory type actuators having good reliability and performance evenness can be manufactured with high productivity.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: September 14, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshio Tomiyoshi, Takahisa Kato, Atsushi Kandori
  • Patent number: 7791886
    Abstract: A heat-dissipating structure for an optical isolator is capable of suppressing an increase in temperature caused by light absorption in a magnetic garnet crystalline film by radiation fins extending from the inside of an external heat conducting cover. The heat-dissipating structure for the optical isolator is formed by housing a magnetic garnet crystalline film (12), first and second heat conductive plates (6, 7, 8 and 9) and magnet 18 in the external heat conducting cover, placing the radiation fins (10 and 11) on the second heat conductive plate, attaching the first heat conductive plates (6 and 7) onto either side of the magnetic garnet crystalline film, arranging the second heat conductive plates (8 and 9) on the outer surface of the first heat conductive plates, and passing the radiation fins through guide openings (2a and 2b) in the isolator holder 2 to the outside of the external heat conductive cover from the extracting opening (3c) to be brought into contact with the outer grooves (4d and 5d).
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: September 7, 2010
    Assignee: Shinkosha Co., Ltd.
    Inventors: Yuzo Ochi, Syoji Kubomura, Masayuki Fujii