Patents by Inventor Robert A. Norwood

Robert A. Norwood has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11454759
    Abstract: In accordance with a method of forming a waveguide in a polymer film disposed on a substrate, a plurality of regions on a polymer film are selectively exposed to a first dosage of radiation. The polymer film is formed from a material having a refractive index that decreases by exposure to the radiation and subsequent heating. At least one region of the polymer film that was not previously exposed to the radiation is selectively exposing to a second dosage of radiation. The second dosage of radiation is less than the first dosage of radiation. The polymer film is heated to complete curing of the polymer film.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: September 27, 2022
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Linan Jiang, Stanley K. H. Pau, Robert A. Norwood, Thomas L. Koch
  • Publication number: 20220244458
    Abstract: A method for establishing optical coupling between spatially separated first and second planar waveguides includes arranging an optical interconnect on the first planar waveguide. The optical interconnect has first and second end portions and an intermediate portion. Each of the end portions has an inverse taper. The second planar waveguide is arranged on the optical interconnect so that the second planar waveguide overlaps with one of the inverse tapered end portions but not the other inverse tapered end portion to thereby enable an adiabatic transition of an optical signal from the first planar waveguide to the second planar waveguide via the optical interconnect. The first and second planar waveguides have different refractive indices at an operating wavelength and the optical interconnect have a higher refractive index at the operating wavelength than the refractive indices of a core of the first planar waveguide and a core of the second planar waveguide.
    Type: Application
    Filed: June 1, 2020
    Publication date: August 4, 2022
    Inventors: Thomas L. Koch, Erfan M. Fard, Roland Himmelhuber, Linan Jiang, Stanley K.H. Pau, Robert A. Norwood, Kyungjo Kim
  • Patent number: 11402752
    Abstract: A method of fabricating an optical connection to at least one planar optical waveguide integrated on a planar integrated circuit (PIC) uses a machine vision system or the like to detect one or more positions at which one or more optical connections are to be made to at least one planar optical waveguide located on the PIC. A spatial light modulator (SLM) is used as a programmable photolithographic mask through which the optical connections are written in a volume of photosensitive material using a photolithographic process. The SLM is programmed to expose the photosensitive material to an illumination pattern that defines the optical connections. The programming is based at least in part on the positions that have been detected by the vision system. The optical connections are printed by exposing the photosensitive material to illumination that is modulated by the pattern with which the SLM is programmed.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: August 2, 2022
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Thomas L. Koch, Robert A. Norwood, Stanley K. H. Pau, Nasser N. Peyghambarian
  • Publication number: 20220162390
    Abstract: The present invention provides chalcogenide hybrid organic/inorganic polymers (“CHIPs” or organic chalcogenide polymers) and methods for producing and using the same. In particular, the chalcogenide hybrid organic/inorganic polymers of the invention comprise a hydrocarbon cyclic ring structure and one or more chalcogenide selected from the group consisting of sulfur, selenium, cyclic selenium sulfide, and a combination thereof.
    Type: Application
    Filed: March 20, 2020
    Publication date: May 26, 2022
    Applicant: Arizona Board of Regents on behalf of the University of Arizona
    Inventors: Dong-Chul ("Jeffrey") PYUN, Robert A. Norwood, Tristan Stephen Kleine, Richard S. Glass, Dennis L. Lichtenberger, Meghan O'Brien Hamilton, Nicholas Lyons, Oliver Spires, Laura E. Anderson
  • Publication number: 20220153902
    Abstract: The present invention provides a composition comprising a plurality of magnetic nanocomposite particles. The magnetic nanocomposite particle comprises a magnetic metallic nanoparticle and a plurality of organic polymer ligands attached to its surface. The composition can also include a host matrix, such as a polymer, in which the magnetic nanocomposite particles are interspersed therein. The compositions of the invention have the Verdet constant of at least 5000°/T-m.
    Type: Application
    Filed: March 4, 2020
    Publication date: May 19, 2022
    Applicant: Arizona Board of Regents on Behalf of the University of Arizona, a body corporate
    Inventors: Dong-Chul "Jeffrey" Pyun, Robert A. Norwood, Nicholas George Pavlopoulos, Kyle Carothers, Lindsey Holmen, Tobias Kochenderfer, Nicholas Lyons
  • Patent number: 11327225
    Abstract: A flexible polymer waveguide array structure serves as a stitch or jumper on an optical printed circuit board (OPCB). The flexible polymer waveguide array structure can be attached to the OPCB so that it can provide a chip-to-OPCB optical connection. The waveguide(s) in the flexible polymer waveguide array structure may be prefabricated before the flexible polymer waveguide array structure is attached to the OPCB. Alternatively, the waveguides may be fabricated after the flexible polymer waveguide array structure has been attached to the OPCB. The waveguide(s) may be subsequently formed using a printing process such as photolithography. As a consequence of forming the waveguide(s) after attachment of the flexible polymer waveguide array to the OPCB, the precision in the lateral alignment that is required when placing the flexible polymer waveguide array structure on the OPCB is generally significantly less than is required when the waveguide(s) are prefabricated.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: May 10, 2022
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Thomas L. Koch, Robert A. Norwood, Stanley K. H. Pau, Nasser N. Peyghambarian
  • Publication number: 20220105695
    Abstract: A method of forming an optical interconnect between first and second photonic chips located on an optical printed circuit board (OPCB) includes applying a coupling agent to a bonding surface of a flexible, freestanding polymer waveguide array film having at least one polymer waveguide disposed therein. The waveguide array film is placed onto the first and second photonic chips so that the waveguide array film extends over a gap and/or a step between the first and second photonic chips to thereby form a bonding interface between the bonding surface of the waveguide array film and the first and second photonic chips. The coupling agent is selected such that optical coupling between the first and second photonic chips arises simultaneously with formation of the bonding interface.
    Type: Application
    Filed: January 17, 2020
    Publication date: April 7, 2022
    Inventors: Linan JIANG, STANLEY K. H. PAU, Robert A. NORWOOD, Thomas L. KOCH
  • Patent number: 11275208
    Abstract: A method of forming an optical interconnect between first and second photonic chips located on an optical printed circuit board includes applying a flexible, freestanding film onto the first and second chips so that the film extends over a gap and/or step between the chips. The film includes a photosensitive layer having a refractive index that decreases by exposure to radiation and a backing layer. The film is exposed to a flood exposure having a radiation dosage penetrating the backing layer and only a surface sublayer of the photosensitive layer. After curing the film, the backing layer is removed so that the photosensitive layer remains on the first and second chips. The photosensitive layer is selectively exposed to a second radiation dosage to define waveguide core(s) in unexposed regions of the photosensitive layer below the surface sublayer. The photosensitive layer is heated to cure the selectively exposed portions.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: March 15, 2022
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Linan Jiang, Stanley K. H. Pau, Robert A. Norwood
  • Publication number: 20220029039
    Abstract: Linear acylindrical lens (and array/system employing a plurality of such lens elements) containing liquid silicone rubber material for use in solar applications, as well as a low-cost silicone based optical lightguide(s) configured to channel and concentrate solar light with about 90% optical efficiency. The lens includes a transparent glass substrate (with an optional coating), which mechanically supports a moldable flexible silicone lenslet optical quality and is bonded to it with the use of plasma and in absence of adhesive material. When injection molding of lightguide(s) is employed, the lightguide shape can be formed variably to provide for integration of multiple lightguide s into an array with alignment tolerances that are looser than in a solar concentrator employing glass waveguides. Optical system employing such (arrayed) linear lens(es) concatenated with corresponding (arrayed) lightguides, juxtaposed with micro-CPV cells and conventional PV-cell(s) to capture diffused light.
    Type: Application
    Filed: November 1, 2019
    Publication date: January 27, 2022
    Inventors: Liliana RUIZ DIAZ, Sifang CUI, Robert NORWOOD, Kyung-Jo KIM
  • Publication number: 20210389504
    Abstract: The present invention provides certain CHIP films and coatings, as well as the preparation and uses thereof. Chalcogenide hybrid organic/inorganic polymers or CHIPs may be suitable for use in antireflection coatings for use with infrared optics, for example as applied to lenses for infrared cameras. The coatings may be applied with spin coating and have a thickness related to the quarter wavelength of the desired infrared wavelengths.
    Type: Application
    Filed: October 1, 2019
    Publication date: December 16, 2021
    Inventors: Dong-Chul Pyun, Robert A. Norwood, Abhinav Nishant, Laura Anderson, Tristan Kleine
  • Publication number: 20210373236
    Abstract: A method of forming an optical interconnect between first and second photonic chips located on an optical printed circuit board includes applying a flexible, freestanding film onto the first and second chips so that the film extends over a gap and/or step between the chips. The film includes a photosensitive layer having a refractive index that decreases by exposure to radiation and a backing layer. The film is exposed to a flood exposure having a radiation dosage penetrating the backing layer and only a surface sublayer of the photosensitive layer. After curing the film, the backing layer is removed so that the photosensitive layer remains on the first and second chips. The photosensitive layer is selectively exposed to a second radiation dosage to define waveguide core(s) in unexposed regions of the photosensitive layer below the surface sublayer. The photosensitive layer is heated to cure the selectively exposed portions.
    Type: Application
    Filed: February 26, 2019
    Publication date: December 2, 2021
    Inventors: Linan JIANG, Stanley K.H. PAU, Robert A. Norwood
  • Patent number: 11163113
    Abstract: An athermal optical waveguide structure such as an optical add drop multiplexer (OADM) or the like is fabricated by a method that includes forming a lower cladding layer on a substrate. A waveguiding core layer is formed on the lower cladding layer. An upper cladding layer is formed on the waveguiding core layer and the lower cladding layer a sol-gel material. The sol-gel material includes an organically modified siloxane and a metal oxide. A thermo-optic coefficient of the sol-gel material is adjusted by curing the sol-gel material for a selected duration of time at a selected temperature such that the thermo-optic coefficient of the sol-gel material compensates for a thermo-optic coefficient of at least the waveguiding core layer such that an effective thermo-optic coefficient of the optical waveguide structure at a specified optical wavelength and over a specified temperature range is reduced.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: November 2, 2021
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Soha Namnabat, Robert A. Norwood, Kyung-Jo Kim, Roland Himmelhuber
  • Patent number: 11078333
    Abstract: Copolymerization of elemental sulfur with functional comonomers afford sulfur copolymers having a high molecular weight and high sulfur content. Nucleophilic activators initiate sulfur polymerizations at relative lower temperatures and in solutions, which enable the use of a wider range of comonomers, such as vinylics, styrenics, and non-homopolymerizing comonomers. Nucleophilic activators promote ring-opening reactions to generate linear polysulfide intermediates that copolymerize with comonomers. Dynamic sulfur-sulfur bonds enable re-processing or melt processing of the sulfur polymer. Chalcogenide-based copolymers have a refractive index of about 1.7-2.6 at a wavelength in a range of about 5000 nm-8????. The sulfur copolymer can be a thermoplastic or a thermoset for use in elastomers, resins, lubricants, coatings, antioxidants, cathode materials for electrochemical cells, dental adhesives/restorations, and polymeric articles such as polymeric films and free-standing substrates.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: August 3, 2021
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA
    Inventors: Dong-Chul Pyun, Richard S. Glass, Robert A. Norwood, Jared J. Griebel, Soha Namnabat
  • Publication number: 20210102012
    Abstract: The present invention provides certain polymeric materials, precursors thereof as well as the preparation and uses thereof.
    Type: Application
    Filed: March 29, 2018
    Publication date: April 8, 2021
    Inventors: Dong-Chul Pyun, Robert A. Norwood, Roland Himmelhuber, Tristan Stephen Kleine, Liliana Ruiz Diaz, Laura E. Anderson
  • Publication number: 20210096819
    Abstract: A method of multiplying together a series of factors includes representing a multiplication operation in terms of a summation of a series of natural logarithmic functions that undergo exponentiation to represent the multiplication of the factors. An optical signal is generated for each of the factors to be multiplied. Each optical signal has a power or energy level that represents its respective factor. Each of the optical signals is applied to a respective material that undergoes a two-photon absorption process to implement a natural logarithm function. Each optical output signal output by the materials is directed to an optical combiner to obtain a summed optical signal. The summed optical signal is directed to a saturable absorber to implement an exponential function. The power or energy of the resulting optical output signal from the saturable absorber represents the product of the factors to be multiplied.
    Type: Application
    Filed: May 13, 2019
    Publication date: April 1, 2021
    Inventors: Masoud BABAEIAN, Nasser PEYGHAMBARIAN, Robert A. Norwood, Mark A. NEIFELD, Pierre Alexandre BLANCHE
  • Publication number: 20200379175
    Abstract: In accordance with a method of forming a waveguide in a polymer film disposed on a substrate, a plurality of regions on a polymer film are selectively exposed to a first dosage of radiation. The polymer film is formed from a material having a refractive index that decreases by exposure to the radiation and subsequent heating. At least one region of the polymer film that was not previously exposed to the radiation is selectively exposing to a second dosage of radiation. The second dosage of radiation is less than the first dosage of radiation. The polymer film is heated to complete curing of the polymer film.
    Type: Application
    Filed: August 20, 2018
    Publication date: December 3, 2020
    Applicant: Arizona Board of Regents on behalf of the University of Arizona
    Inventors: Linan JIANG, Stanley, K. H. PAU, Robert A. NORWOOD, Thomas L. KOCH
  • Publication number: 20200264370
    Abstract: An athermal optical waveguide structure such as an optical add drop multiplexer (OADM) or the like is fabricated by a method that includes forming a lower cladding layer on a substrate. A waveguiding core layer is formed on the lower cladding layer. An upper cladding layer is formed on the waveguiding core layer and the lower cladding layer a sol-gel material. The sol-gel material includes an organically modified siloxane and a metal oxide. A thermo-optic coefficient of the sol-gel material is adjusted by curing the sol-gel material for a selected duration of time at a selected temperature such that the thermo-optic coefficient of the sol-gel material compensates for a thermo-optic coefficient of at least the waveguiding core layer such that an effective thermo-optic coefficient of the optical waveguide structure at a specified optical wavelength and over a specified temperature range is reduced.
    Type: Application
    Filed: August 14, 2018
    Publication date: August 20, 2020
    Inventors: Soha NAMNABAT, Robert A. NORWOOD, Kyung-Jo KIM, Roland HIMMELHUBER
  • Publication number: 20200132931
    Abstract: An optical arrangement includes an optical printed circuit board (OPCB) having at least a first optical waveguide having a first end located on the OPCB. The optical arrangement also includes at least one photonic integrated circuit (PIC) mounted to the OPCB. The PIC includes a second optical waveguide. The first waveguide has a second end located on a portion of the second waveguide to optically couple light between the PIC and the first waveguide. The portion of the second waveguide on which the second end of the first waveguide is located has an inverse taper. The inverse tapered portion is defined by a plurality of segments. The segments of the inverse tapered portion each have a length and a taper rate that causes each segment to make an equal contribution to any radiation losses in the mode transformation of light being coupled between the first and second waveguides.
    Type: Application
    Filed: January 30, 2018
    Publication date: April 30, 2020
    Inventors: Erfan M. FARD, Robert A. NORWOOD, Thomas L. Koch, Stanley K. Pau
  • Publication number: 20190098751
    Abstract: A flexible polymer waveguide array structure serves as a stitch or jumper on an optical printed circuit board (OPCB). The flexible polymer waveguide array structure can be attached to the OPCB so that it can provide a chip-to-OPCB optical connection. The waveguide(s) in the flexible polymer waveguide array structure may be prefabricated before the flexible polymer waveguide array structure is attached to the OPCB. Alternatively, the waveguides may be fabricated after the flexible polymer waveguide array structure has been attached to the OPCB. The waveguide(s) may be subsequently formed using a printing process such as photolithography. As a consequence of forming the waveguide(s) after attachment of the flexible polymer waveguide array to the OPCB, the precision in the lateral alignment that is required when placing the flexible polymer waveguide array structure on the OPCB is generally significantly less than is required when the waveguide(s) are prefabricated.
    Type: Application
    Filed: April 28, 2017
    Publication date: March 28, 2019
    Inventors: Thomas L. KOCH, Robert A. NORWOOD, Stanley K.H. PAU, Nasser N. PEYGHAMBARIAN
  • Patent number: 10241199
    Abstract: Devices are disclosed for obtaining data of a sample, particularly data capable of being processed to produce an image of a region of the sample. An exemplary device includes a light-beam source, an acoustic-wave source, an optical element, and an acoustic detector. The optical element is transmissive to a light beam produced by the light-beam source and reflective to acoustic waves produced by the acoustic-wave source. The optical element is situated to direct the transmitted light beam and reflected acoustic wave simultaneously along an optical axis to be incident at a situs in or on a sample to cause the sample to produce acoustic echoes from the incident acoustic waves while also producing photoacoustic waves from the incident light beam photoacoustically interacting with the situs. The acoustic detector is placed to receive and detect the acoustic echoes and the photoacoustic waves from the situs. The acoustic detector can comprise one or more hydrophones exploiting the acousto-electric effect.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: March 26, 2019
    Assignee: The Arizona Board of Regents on Behalf of the University of Arizona
    Inventors: Russell S. Witte, Leonardo Gabriel Montilla, Ragnar Olafsson, Charles M. Ingram, Zhaohui Wang, Robert A. Norwood, Charles Greenlee