Variable Grating Patents (Class 359/573)
  • Patent number: 10440300
    Abstract: Systems and methods are described that relate to an optical system including an image sensor optically-coupled to at least one nanophotonic element. The image sensor may include a plurality of superpixels. Each respective superpixel of the plurality of superpixels may include at least a respective first pixel and a respective second pixel. The at least one nanophotonic element may have an optical phase transfer function and may include a two-dimensional arrangement of sub-wavelength regions of a first material interspersed within a second material, the first material having a first index of refraction and the second material having a second index of refraction. The nanophotonic element is configured to direct light toward individual superpixels in the plurality of superpixels, and to direct light toward the first or second pixel in each individual superpixel based on a wavelength dependence or a polarization dependence of the optical phase transfer function.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: October 8, 2019
    Assignee: Verily Life Sciences LLC
    Inventors: Eden Rephaeli, Victor Marcel Acosta, Andrew Homyk
  • Patent number: 10412325
    Abstract: Systems and methods for hyperspectral and multispectral imaging are disclosed. A system includes a lens and an imaging device having a plurality of pixel sensors. A focus corrector is located within the optical path to refract at least a portion of the incoming light and change the focusing distance of specific wavelengths of light to converge at a focal plane. The focal corrector is selected based upon the imaging system to reduce an overall measure of deviation between a focal length curve for the lens and a focus position curve for pixel sensors to produce focused imaging data for a broad spectrum of light, including beyond the visible range.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: September 10, 2019
    Assignee: Urugus S.A.
    Inventors: Gerardo Gabriel Richarte, Agustina Pose, David Vilaseca, Pablo Jais, Juan Manuel Vuletich
  • Patent number: 10305243
    Abstract: The laser cavity is positioned on a substrate and includes a cavity waveguide guiding a laser light signal between a gain medium and a partial return device. The partial return device receives the laser light signal from the cavity waveguide and returns a first portion of the laser light signal to the cavity waveguide. The partial return device transmits a second portion of the laser light signal to an output waveguide. The partial return device reflects different wavelengths of the laser light signal at different intensities. Additionally, the partial return device is configured such that when the most intense wavelength of the laser light signal reflected by the partial return device is the same as a wavelength of one of modes of the laser light signal, the mode with the next longest wavelength and the mode with the next shortest wavelength are each reflected by the partial return device at an intensity greater than 80% of the intensity of the most intensely reflected wavelength.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: May 28, 2019
    Assignee: Mellanox Technologies Silicon Photonics Inc.
    Inventors: Mehdi Asghari, Dazeng Feng
  • Patent number: 10281648
    Abstract: A substrate is composed of a first material. A photonic structure is composed of the first material connected to one or more support structures composed of the first material between the photonic structure and a surface of the substrate, with at least one of the support structures supporting a first section of a strip of the photonic structure. The first section has a width that is wider than a width of a second section of the strip and has a length that is at least about twice the width of the second section of the strip.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: May 7, 2019
    Assignee: PRESIDENT AND FELLOWS OF HARVARD COLLEGE
    Inventors: Michael J. Burek, Marko Loncar
  • Patent number: 10097389
    Abstract: A reflective modulator comprises a coupler, two diodes and two DC block units. The coupler has an input end used to output an output signal, an output end used to output an output signal, a first load end connected to one of the diodes and a second load end connected to another one of the diodes. The DC block units connect between the diodes and the coupler for DC blocking. A message signal is selectively inputted to both of the two DC block units for operating the state of the two diodes. A BPSK modulator using the reflective modulator and a quadrature modulator using the BPSK modulator are also introduced.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: October 9, 2018
    Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Hong-Yeh Chang, Xiang Lin, Chien-Te Yu, Hung-Ting Chou
  • Patent number: 10036886
    Abstract: Pointing and positioning system of light beams and images including a plurality of cycloidal diffractive waveplates, each waveplate capable of deviating a generally broadband light beam over a predetermined angle. The lateral translation and deviation angles of the light beams are controlled by controlling the relative distance, rotational position, and the diffraction efficiency of at least one in the plurality of waveplates.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: July 31, 2018
    Assignees: Beam Engineering for Advanced Measurements Co., The United States of America as Represented by the Secretary of the Army
    Inventors: Nelson V. Tabirian, Sarik R. Nersisyan, Brian R. Kimball, Diane M. Steeves
  • Patent number: 10031339
    Abstract: An optical combiner includes an off-axis spatially multiplexed lens optically coupled to receive image light and direct the image light in an eye-ward direction. The off-axis spatially multiplexed lens includes a first sub-lens multiplexed with a second sub-lens. The first sub-lens and the sub-lens are configured to direct the image light to designated eyeward-regions.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: July 24, 2018
    Assignee: Google LLC
    Inventors: Bernard C. Kress, Greg E. Priest-Dorman
  • Patent number: 9995930
    Abstract: A focusing device includes a substrate and a plurality of scatterers provided at both sides of the substrate. The scatterers on the both sides of the focusing device may correct geometric aberration, and thus, a field of view (FOV) of the focusing device may be widened.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: June 12, 2018
    Assignees: SAMSUNG ELECTRONICS CO., LTD., CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Amir Arbabi, Seunghoon Han, Andrei Faraon
  • Patent number: 9829717
    Abstract: An apparatus for sorting orbital angular momentum eigenstates of one or more photons includes at least one transformation PBOE configured to sort orbital angular momentum eigenstates of the one or more photons, at least one phase correction PBOE configured to sort spin angular momentum eigenstates of the one or more photons. A method for sorting orbital angular momentum eigenstates of one or more photons includes using at least one transformation PBOE to sort orbital angular momentum eigenstates of the one or more photons, and using at least one phase correction PBOE to sort spin angular momentum eigenstates of the one or more photons.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: November 28, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventor: Gary Walsh
  • Patent number: 9690161
    Abstract: A diffraction grating comprises a liquid crystal (LC) cell configured to apply an electric field through a cholesteric LC material that induces the cholesteric LC material into a heliconical state with an oblique helicoid director. The applied electric field produces diffracted light from the cholesteric LC material within the visible, infrared or ultraviolet. The axis of the heliconical state is in the plane of the liquid crystal cell or perpendicular to the plane, depending on the application. A color tuning device operates with a similar heliconical state liquid crystal material but with the heliconical director axis oriented perpendicular to the plane of the cell. A power generator varies the strength of the applied electric field to adjust the wavelength of light reflected from the cholesteric liquid crystal material within the visible, infrared or ultraviolet.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: June 27, 2017
    Assignee: KENT STATE UNIVERSITY
    Inventors: Oleg D. Lavrentovich, Sergij V. Shiyanovsii, Jie Xiang, Young-Ki Kim
  • Patent number: 9606273
    Abstract: A diffractive MEMS device has an in-plane binary reflective diffraction pattern formed in an outer surface of a tiltable platform. The binary reflective diffraction pattern includes rectangular or trapezoidal ridges and valleys, or grooves, of a same depth. The binary reflective diffractive pattern has a high diffraction efficiency even though the surfaces of the “grooves” or “ridges” are not perpendicular to the incoming optical beam. The diffractive pattern is supported by a pair of torsional hinges and is tiltable by an electrostatic actuator. The electrostatic actuator can include at least one side electrode for linearization of dependence of tilt angle on the voltage applied to the actuator.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: March 28, 2017
    Assignee: Lumentum Operations LLC
    Inventors: John Michael Miller, Wenlin Jin
  • Patent number: 9568672
    Abstract: An optical coupling system and method of fabrication are included. The optical coupling system includes a substrate layer and an optical waveguide material overlying the substrate layer. The optical waveguide material can include a grating. The system also includes a cover material overlying the optical waveguide material to couple an optical signal to the optical waveguide material via the grating at a coupling angle. Approximately zero energy of the coupled optical signal is lost in the substrate layer due to a combination of the coupling angle and a difference in refractive indices between the cover material and the substrate layer.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: February 14, 2017
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: David A. Fattal, Zhen Peng, Marco Fiorentino, Raymond G. Beausoleil
  • Patent number: 9551872
    Abstract: An optical combiner includes an off-axis spatially multiplexed lens optically coupled to receive image light and direct the image light in an eye-ward direction. The off-axis spatially multiplexed lens includes a first sub-lens multiplexed with a second sub-lens. The first sub-lens and the sub-lens are configured to direct the image light to designated eyeward-regions.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: January 24, 2017
    Assignee: Google Inc.
    Inventors: Bernard C. Kress, Greg E. Priest-Dorman
  • Patent number: 9261632
    Abstract: A light emitting diode device is described which includes at least one planar non-periodic high-index-contrast grating. The light emitting diode device includes a cavity formed between a reflective optical element and a transmissive optical element. One or both of the optical elements can be a planar non-periodic high-index-contrast grating. The transmissive optical element can be a collimating lens used to collimate incident beams of light while the reflective optical element can be a parabolic reflector used to reflect incident beams of light along a direction opposite to an incidence direction. A light emitter can be disposed within the cavity and can emit beams of light.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: February 16, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Zhen Peng, Nathaniel Quitoriano, Marco Fiorentino
  • Patent number: 9146443
    Abstract: A three-dimensional circuit includes a hyperbolic bicontinuous structure forming a substrate; circuits formed on a first surface of the hyperbolic bicontinuous structure; and electrically conductive traces formed between the circuits. The electrically conductive traces are formed two-dimensionally on the first surface of the hyperbolic bicontinuous structure. The electrically conductive traces are effectively three-dimensional traces between the circuits.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: September 29, 2015
    Inventor: Robert William Corkery
  • Patent number: 9122820
    Abstract: A method, system or device for configuring an optical coupling device including obtaining characteristics of an optical signal and ambient conditions for storage in memory, utilizing a processor for identifying an optimum effective subwavelength area refractive index and a grating period for the input signal and ambient characteristics stored in memory, and utilizing the processor for identifying a preferred filling factor for a transverse polarization.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: September 1, 2015
    Assignee: Board of Regents, The University of Texas System
    Inventors: Ray T. Chen, Xiaochuan Xu
  • Patent number: 9014518
    Abstract: A bearing comprises a Bragg grated optical fiber to measure one or more parameters of the bearing. The optical fiber is coupled to the bearing in such a way that at least a part of the optical fiber that comprises Bragg grating is curved. The grating which is curved is adapted to the curvature in such a way that the frequency response is well defined and not spread out. This is achieved by arranging the gratings such that even though the fiber is curved the gratings appear to be substantially parallel instead of being influenced by the curvature.
    Type: Grant
    Filed: November 26, 2010
    Date of Patent: April 21, 2015
    Assignee: Aktiebolaget SKF
    Inventor: Adam Reedman
  • Patent number: 8976450
    Abstract: A light switch (or valve) made up of two mutually inverted, substantially identical diffraction gratings with a liquid medium therebetween, arranged to allow the grating substrates to be shifted laterally relative to one another so as to align and mis-align the grating elements. When aligned, incident-polarized light passes through the switch and when misaligned, light does not pass through the switch but is reflected.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: March 10, 2015
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., The Trustees of the University of Pennsylvania
    Inventors: Hideo Iizuka, Nader Engheta, Hisayoshi Fujikawa
  • Patent number: 8965152
    Abstract: A projection display 210 arranged to display an image to an observer 212 use waveguide techniques to generate a display defining a large exit pupil at the point of the observer 212 and a large field of view, while using a small image-providing light source device. The projection display 210 uses two parallel waveguides 214, 216 made from a light transmissive material. One waveguide 214 stretches the horizontal pupil of the final display and the other waveguide 216 stretches the vertical pupil of the final display and acts as a combiner through which the observer 212 views an outside world scene 220 and the image overlaid on the scene 220. In a color display, each primary color is transmitted within a separate channel R, G, B.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: February 24, 2015
    Assignee: Bae Systems PLC
    Inventor: Michael David Simmonds
  • Patent number: 8854596
    Abstract: An active optical device includes a substrate; a plurality of refractive index variable regions formed on the substrate; and a voltage applier which applies an electric field to the plurality of refractive index variable regions.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: October 7, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sun-il Kim, Jun-hee Choi
  • Publication number: 20140285893
    Abstract: The objective of the present invention is providing optical systems for controlling with propagation of light beams in lateral and angular space, and through optical apertures. Said light beams include laser beams as well as beams with wide spectrum of wavelengths and large divergence angles. Said optical systems are based on combination of diffractive waveplates with diffractive properties that can be controlled with the aid of external stimuli such as electrical fields, temperature, optical beams and mechanical means.
    Type: Application
    Filed: June 13, 2013
    Publication date: September 25, 2014
    Applicant: U.S. Government as Represented by the Secretary of the Army
    Inventors: Nelson V. Tabirian, Sarik R. Nersisyan, Brian R. Kimball, Diane M. Steeves
  • Patent number: 8842363
    Abstract: An apparatus for dynamically varying an optical characteristic of a light beam includes an optical element configured to receive a beam of light. The optical element includes at least one sub-wavelength grating formed of a plurality of lines. The apparatus includes at least one actuator connected to at least one component of the optical element and a controller for controlling the at least one actuator to dynamically vary a characteristic of the beam of light that is at least one of emitted through and reflected from the optical element.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: September 23, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sagi Varghese Mathai, Jingjing Li, Alexandre M. Bratkovski
  • Patent number: 8808586
    Abstract: A molded part prepared by a mold transfer method using a die, including a surface which includes a slope, wherein a direction of a normal line of the slope is different from a die releasing direction; and a pattern which is formed on the surface and which includes grooves located on a portion of the slope so as to extend along the slope in the slanting direction of the slope. An optical element, which has an anti reflection function, including the molded part mentioned above, wherein the interval between two adjacent grooves is not greater than the wavelength of light irradiating the optical element. An optical device including a light source configured to emit light; and the optical element mentioned above which processes the light emitted by the light source.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: August 19, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Hiroyuki Endo
  • Patent number: 8811823
    Abstract: The invention provides an optical device, including a light-transmissive substrate, and a pair of different, parallel gratings including a first grating and second grating, located on the substrate at a constant distance from each other, each of the pair of parallel gratings including at least one sequence of a plurality of parallel lines, wherein the spacings between the lines gradually increase from one edge of the grating up to a maximum distance between the lines, and wherein the arrangement of lines in the second grating is in the same direction as that of the first grating. A system utilizing a plurality of such optical devices is also disclosed.
    Type: Grant
    Filed: October 8, 2008
    Date of Patent: August 19, 2014
    Assignee: Beamus, Ltd.
    Inventor: Yaakov Amitai
  • Publication number: 20140185286
    Abstract: There is provided a colour sequential illumination device comprising in series: first and second light sources; a condenser lens; and a grating device. The grating device comprises at least one Bragg grating. The condenser lens directs light from the first and second sources into the grating device at first and second incidence angles respectively. The grating device diffracts light from the first and second sources into a common direction. Desirably, the Bragg gratings are Electrically Switchable Bragg Gratings. In one embodiment of the invention the light sources are Light Emitting Diodes. Alternatively lasers may be used.
    Type: Application
    Filed: December 19, 2013
    Publication date: July 3, 2014
    Inventors: Milan Momcilo POPOVICH, Jonathan David WALDERN
  • Patent number: 8743460
    Abstract: An element includes a first resin layer and a second resin layer disposed between a first glass lens substrate and a second glass lens substrate, a boundary surface between the first resin layer and the second resin layer having a diffraction grating shape including a plurality of inclined surfaces and wall surfaces. The second resin layer is composed of a fluororesin in which fine metal oxide particles are dispersed. Since a refractive index distribution easily occurs in this material during curing by application of ultraviolet light, by applying ultraviolet light substantially perpendicular to the inclined surfaces of the diffraction grating shape, a refractive index distribution is formed in the thickness direction perpendicularly to the inclined surfaces.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: June 3, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masaaki Nakabayashi
  • Patent number: 8717676
    Abstract: A diffractive light outcoupling unit for forming a part of a directive light outcoupling system of a lighting device including a plurality of diffractive outcoupling units. The diffractive light outcoupling units each include a carrier element for accommodating a diffractive surface relief pattern, and a diffractive surface relief pattern including a plurality of consecutive diffractive surface relief forms defined on a surface area of the carrier element arranged to couple light incident on the diffractive surface relief pattern outside the carrier element via interaction involving at least two surface relief forms of the plurality of surface relief forms of the diffractive surface relief pattern so as to enhance the directivity of the coupled light. A diffractive light outcoupling system includes a plurality of diffractive light outcoupling units. A lightguide includes the outcoupling system.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: May 6, 2014
    Assignee: Modilis Holdings LLC
    Inventor: Kari Rinko
  • Patent number: 8699137
    Abstract: A device that provides light beam switching, agile steering of the light beam over a range of angles, and generation of arbitrary wavefront shapes with high spatial and temporal resolution. The agile device can include a volume diffractive structure comprising Bragg planes having one refractive index and the Bragg planes separated by regions containing an active optical medium. Electrodes (which may be the Bragg planes themselves, or may be arrayed adjacent to the active optical medium) are used to control the electric field intensity and direction across the structure, and thereby control the diffraction efficiency of the structure and the local phase delay imposed on a diffracted wavefront. Means are provided for addressing the many thousands of electrodes required for precise and rapid wavefront control. Applications include free-space atmospheric optical communications, near-eye displays, direct-view 3D displays, optical switching, and a host of other applications.
    Type: Grant
    Filed: August 1, 2011
    Date of Patent: April 15, 2014
    Assignee: Vuzix Corporation
    Inventor: Stephen Paul McGrew
  • Patent number: 8687277
    Abstract: A “Stacked-Grating Light Modulator” (“SGLM”) comprises two diffraction grating elements, a reflection grating and a transmission grating, in close parallel proximity. An incident beam transmits through the transmission grating and is reflected by the reflection grating back through the transmission grating. The relative lateral position of the two gratings is varied to modulate the beam's zero-order reflectance.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: April 1, 2014
    Inventor: Kenneth C. Johnson
  • Patent number: 8681423
    Abstract: A light modulator includes a light guide to guide light, a diffraction grating at a surface of the light guide, and a fluid having a refractive index substantially matched to a refractive index of the diffraction grating. The diffraction grating is to couple out a portion of guided light from the light guide using diffractive coupling. The index-matched fluid is to be selectively moved both into contact with the diffractive grating to defeat the diffractive coupling and out of contact with the diffraction grating to facilitate the diffractive coupling to modulate the coupled out guided light.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: March 25, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Gary Gibson, David A Fattal
  • Patent number: 8681424
    Abstract: A diffractive optical element has higher diffraction efficiency of diffracted light of a designed order in a visible wavelength range. The diffractive optical element includes a diffraction grating part provided on a lens surface of an optical system and constituted by laminating first and second diffraction gratings made of two different materials. Each of the first and second diffraction gratings includes a grating surface and a grating wall surface. The grating surfaces of the first and second diffraction gratings are in contact with each other. The diffraction grating part has the designed order of at least +2nd order and has a grating height of at least 6 ?m.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: March 25, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Reona Ushigome
  • Publication number: 20130314793
    Abstract: In embodiments of waveguide optics focus elements, an imaging structure includes a waveguide for viewing of an environment that is viewable with the imaging structure. The waveguide transmits light of a virtual image that is generated to appear as part of the environment for augmented-reality imaging or virtual-reality imaging. The imaging structure also includes one or more focus elements that are integrated in the waveguide and switchable to focus the virtual image at a focus depth that approximately correlates to a focal distance of the environment. The focus elements can each be implemented for a different focus depth of the virtual image, and the focus depth is adjustable based on a combination of the focus elements being switched-on or switched-off.
    Type: Application
    Filed: May 22, 2012
    Publication date: November 28, 2013
    Inventors: Steven John Robbins, Ian Anh Nguyen, David D. Bohn
  • Patent number: 8593562
    Abstract: A refraction at a suitably structured surface for example with an arrangement of the same between image plane and mapping optics is used to realize on the one hand a desired aliasing filtering or spatial low-pass filtering on the image plane wherein on the other hand the manufacturing of such structured surfaces may be realized in a cost-effective way. In addition to that, the plate thickness except for the amplitude of the surface structure and aspects of the stability of the plate is of no importance for handling the same, so that the integration into optical systems is facilitated.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 26, 2013
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Juergen Ernst, Michael Schoeberl, Alexander Oberdoerster
  • Publication number: 20130258477
    Abstract: An optically variable device and method of manufacturing the device is disclosed, the device including a plurality of zero-order diffraction grating elements some of which are modulated such that a coloured at least partially polarised image is visible to a person viewing the device, observing a first optically variable effect when the device is rotated about an axis substantially perpendicular to the plane, and a second optically variable effect when the device is viewed under polarised light and rotated about an axis substantially perpendicular to or parallel with the plane. The device is particularly suitable for security documents such as bank notes. Preferably, the first optically variable effect is produced by a change in brightness and/or colour of the grating elements and the second optically variable effect may likewise be produced by a change in brightness and/or colour of the grating elements.
    Type: Application
    Filed: August 9, 2011
    Publication date: October 3, 2013
    Inventors: Phei Lok, Robert Arthur Lee
  • Publication number: 20130250420
    Abstract: A dynamic optical crossbar array includes a first set of parallel transparent electrode lines, a bottom set of parallel electrode lines that cross said transparent electrode lines, and an optically variable material disposed between said first set of transparent electrode lines and said bottom set of electrode lines.
    Type: Application
    Filed: January 7, 2011
    Publication date: September 26, 2013
    Inventors: Jianhua Yang, Alexandre M. Bratkovski, David A. Fattal, Minxian Max Zhang
  • Patent number: 8537310
    Abstract: A liquid crystal device includes a first polarization grating (101), a second polarization grating (102), and a liquid crystal layer (103). The first polarization grating (101) is configured to polarize and diffract incident light (190) into first and second beams (195,196) having different polarizations and different directions of propagation relative to that of the incident light (190). The liquid crystal layer (103) is configured to receive the first and second beams (195,196) from the first polarization grating (101). The liquid crystal layer (103) is configured to be switched between a first state that does not substantially affect respective polarizations of the first and second beams (195,196) traveling therethrough, and a second state that alters the respective polarizations of the first and second beams (195,196) traveling therethrough.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: September 17, 2013
    Assignee: North Carolina State University
    Inventors: Michael James Escuti, Chulwoo Oh, Ravi Komanduri, Brandon L. Conover, Jihwan Kim
  • Patent number: 8500805
    Abstract: A method of manufacturing an aphakic intraocular lens that is capable of ensuring every multi-focusing effect more securely, while reducing the impact of aperture changes and lens eccentricity. At least two reliefs whose first order diffracted lights give respective focal distances different from one another are set to overlap with each other in at least a part of an area in a radial direction of the lens, and with respect to every grating pitches of one relief having a maximum grating pitch among the reliefs set up in overlap, grating pitches of another relief are overlapped periodically in order to obtain a relief pattern, so that the resulting relief pattern is formed on a lens surface.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: August 6, 2013
    Assignee: Menicon Co., Ltd.
    Inventors: Atsushi Kobayashi, Hiroaki Suzuki, Ichiro Ando
  • Patent number: 8498053
    Abstract: A spatial light modulator for modulating light field amplitude comprises a surface relief grating adapted to act as a diffractive lens, where a material is used to fill at least one groove of a surface grating structure, such that a controllable refractive index birefringence of the material inside the surface relief grating is controlled by an electric field, which leads to a controllable intensity at a fixed focal point.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: July 30, 2013
    Assignee: Seereal Technologies S.A.
    Inventors: Gerald Futterer, Stephan Reichelt
  • Patent number: 8488646
    Abstract: Enhanced reflectivity High-Contrast Gratings are described which operate in different medium. An HCG is described with a deep/buried metallization layer separated at a distance of least three to four grating thicknesses from the grating. Reflective bandwidth of the HCG is substantially increased, such as by a factor or five, by inclusion of the deep/buried metallization layer. An HCG is described which provides high reflectivity, even when embedded into materials of a moderate to high index of refraction, such as semiconductor material. Vertical cavity surface emitting laser embodiments are described which utilize these reflectivity enhancements, and preferably utilize HCG reflectors for top and/or bottom mirrors.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: July 16, 2013
    Assignee: The Regents of the University of California
    Inventors: Connie Chang-Hasnain, Christopher Chase, Igor Karagodsy
  • Patent number: 8405900
    Abstract: There is provided a projection apparatus including a light source, a micromirror element which tilts a plurality of micromirrors arranged in an array +A° or ?A° (A>0) separately from an array surface to form a light image with light components reflected by the plurality of micromirrors, an illumination optical system which uses light emitted from the light source and causes illumination light whose incidence angle is (2A+?)° (?>0) to enter the micromirror element from a direction to which a less than 45° turn is made from a narrow side direction of the array surface of the micromirror element, and a projection optical system which a light image output from the micromirror element enters and which projects the light image onto a projection object.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: March 26, 2013
    Assignee: Casio Computer Co., Ltd.
    Inventor: Masakuni Iwanaga
  • Publication number: 20130058370
    Abstract: Planar lenses and reflectors are described comprising subwavelength high-contrast gratings (HCG) having high index of refraction grating elements spaced apart from one another in straight and/or curved segments and surrounded by low index material. The high-contrast grating is configured to receive an incident wave which excites multiple modes within the high-contrast grating and is focused for reflection and/or transmission by said high contrast grating. The width of the high contrast grating bars vary along a distribution direction of the grating bars which is perpendicular to the length of the grating bars and/or varies along the length of one or more grating bars to focus said reflection and/or transmission. The HCG is configured to provide double focusing, whose use is exemplified within a vertical cavity surface emitting laser (VCSEL) structure using focusing HCG structures for both the top and bottom mirrors.
    Type: Application
    Filed: August 23, 2012
    Publication date: March 7, 2013
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Connie Chang-Hasnain, Christopher Chase, Fanglu Lu, Forrest G. Sedgwick, Igor Karagodsky
  • Publication number: 20130038937
    Abstract: A tunable optical diffraction grating apparatus, such as but not limited to a tunable Fresnel zone lens apparatus, includes a plurality of symmetric repeating structures (i.e., typically concentric rings) located over a substrate and comprising a material susceptible to a transparent to opaque transition for a designated radiation wavelength. The tunable optical diffraction grating apparatus also includes a means for separately effecting the transparent to opaque transition for each of the plurality of symmetric repeating structures to provide a plurality of transparent zones each comprising a variable first sub-plurality of adjacent transparent symmetric repeating structures alternating and interposed between a plurality of opaque zones each comprising a variable second sub-plurality of adjacent opaque symmetric repeating structures. Also included are a method for fabricating the tunable optical diffraction grating apparatus and a method for operating the tunable optical diffraction grating apparatus.
    Type: Application
    Filed: August 10, 2011
    Publication date: February 14, 2013
    Applicant: UNIVERSITY OF CENTRAL FLORIDA
    Inventors: Glenn Boreman, David Shelton
  • Patent number: 8369017
    Abstract: The invention disclosed here teaches methods and apparatus for altering the temporal and spatial shape of an optical pulse. The methods correct for the spatial beam deformation caused by the intrinsic DC index gradient in a volume holographic chirped reflective grating (VHCRG). The first set of methods involves a mechanical mean of pre-deforming the VHCRG so that the combination of the deflection caused by the DC index gradient is compensated by the mechanical deformation of the VHCRG. The second set of methods involves compensating the angular deflection caused by the DC index gradient by retracing the diffracted beam back onto itself and by re-diffracting from the same VHCRG. Apparatus for temporally stretching, amplifying and temporally compressing light pulses are disclosed that rely on the methods above.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: February 5, 2013
    Assignee: Ondax, Inc.
    Inventors: Christophe Moser, Frank Havermeyer
  • Publication number: 20130027777
    Abstract: A method for space-variant manipulating of thermal emission from a surface of a material that supports surface waves includes providing a grating with a spatially varying grating parameter on the surface of the material.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 31, 2013
    Inventors: Erez Hasman, Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner
  • Patent number: 8363298
    Abstract: The specification and drawings present a new method, apparatus and software product for modulation of the optical intensity using electro-wetting (EW) diffraction gratings in the electronic devices with an electrical control signal. The EW diffraction gratings can be components of an element (e.g., a display) of the electronic device. Applications may include but are not limited to color displays, projection displays, front illuminating displays, field sequential displays, auto-stereoscopic displays, etc. Also, applications in areas other than displays are possible.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: January 29, 2013
    Assignee: Nokia Corporation
    Inventor: Pasi Ryytty
  • Patent number: 8314990
    Abstract: A film (1) which includes at least one transparent replicating layer (2) having a diffractive relief structure (3) and a reflective layer, the reflective layer being formed by at least one pigmented lake layer (4), and the film (1, 1?, 1?) showing a latent optically variable effect produced by the diffractive relief structure (3), and the use thereof. Further a method for the production of such a film.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: November 20, 2012
    Assignees: Leonhard Kurz Stiftung & Co., Erich Utsch AG
    Inventors: Hubert Suessner, Mathias Thaeter
  • Patent number: 8306376
    Abstract: There is provided an optical multiplexer including: a substrate having a plurality of beam transmitting portions; and diffraction gratings diffracting beams irradiated to the beam transmitting portions at different angles, each diffraction grating being formed in the corresponding beam transmitting portion. Accordingly, it is possible to reduce an alignment error and manufacturing cost and to reduce the entire size of a recording apparatus or a reproducing apparatus.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: November 6, 2012
    Assignee: Wi-LAN Inc.
    Inventor: Kun-Yul Kim
  • Publication number: 20120268736
    Abstract: A configurable grating based on collapsing nano-fingers includes a substrate; and a plurality of bendable nano-fingers supported on the substrate. The nano-fingers may be formed in a regular first array and the nano-fingers may be formed in a spacing that, upon closing at their tops, forms a second array to act as an optical grating or a diagnostic tool. A method of fabricating a configurable optical grating based on collapsing nano-fingers is also disclosed, as well as a method of determining an open or closed state for a plurality of nano-fingers.
    Type: Application
    Filed: April 19, 2011
    Publication date: October 25, 2012
    Inventors: David A. Fattal, Raymond G. Beausoieil, Zhiyong Li
  • Patent number: 8274738
    Abstract: A method for Space-variant polarization manipulation of enhanced nondirectional thermal emission in a narrow spectral peak is disclosed, comprising providing a subwavelength grating irradiating non-directional thermal emission on the grating and discretely controlling the local orientation of the grating.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: September 25, 2012
    Assignee: Technion Research & Development Foundation Ltd.
    Inventors: Erez Hasman, Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner
  • Patent number: 8270080
    Abstract: An element includes a first resin layer and a second resin layer disposed between a first glass lens substrate and a second glass lens substrate, a boundary surface between the first resin layer and the second resin layer having a diffraction grating shape including a plurality of inclined surfaces and wall surfaces. The second resin layer is composed of a fluororesin in which fine metal oxide particles are dispersed. Since a refractive index distribution easily occurs in this material during curing by application of ultraviolet light, by applying ultraviolet light substantially perpendicular to the inclined surfaces of the diffraction grating shape, a refractive index distribution is formed in the thickness direction perpendicularly to the inclined surfaces.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: September 18, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masaaki Nakabayashi