Patents by Inventor Zhaowei Liu

Zhaowei Liu 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).

  • Publication number: 20210050494
    Abstract: A light emitting diode may include a light emission layer and a charge transport layer disposed on the light emission layer. A grating including a plurality of nanoholes may be formed by removing a portion of the charge transport layer and/or the light emission layer and depositing a plasmonic metamaterial on a remaining portion of the charge transport layer and/or the light emission layer. The nanoholes may include the plasmonic metamaterial deposited inside the recesses formed by the remaining portion of the charge transport layer and/or the light emission layer, with an additional portion of the charge transport layer disposed on top. A pitch, diameter, and/or depth of the nanoholes may be configured to maximize the quantum efficiency of the light emitting diode, especially at a microscale of less than 100 microns.
    Type: Application
    Filed: August 14, 2020
    Publication date: February 18, 2021
    Inventors: Lorenzo Ferrari, Zhaowei Liu
  • Patent number: 10852189
    Abstract: A spectrometry system may include an etalon array having a first etalon and a second etalon. The first etalon may be configured to process light to at least generate a first transmission pattern. The first transmission pattern may have at least a first transmission peak corresponding to a first wavelength in an original spectrum of the light. The second etalon may be configured to process the light to at least generate a second transmission pattern. The second transmission pattern may have at least a second transmission peak corresponding to a second wavelength in the original spectrum of the light. The first etalon may have a different thickness than the second etalon in order for the first transmission pattern to have at least one transmission peak that is at a different wavelength than the second transmission pattern. The first transmission pattern and the second transmission pattern may enable a reconstruction the original spectrum of the light.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: December 1, 2020
    Assignee: The Regents of the University of California
    Inventors: Zhaowei Liu, Qian Ma, Eric Huang
  • Patent number: 10571672
    Abstract: An apparatus for compressive sensing may include a filter array, a detector, and a reconstruction engine. The filter array may be configured to generate a first illumination pattern in response to a first wavelength of light and a second illumination pattern in response to a second wavelength of light. The first illumination pattern and the second illumination pattern may be projected onto an object. The detector may be configured to determine a first intensity of a first light emitted by the object in response to the first illumination pattern and a second intensity of a second light emitted by the object in response to the second illumination pattern. The reconstruction engine may be configured to generate an image of the object based at least on the first intensity, the first illumination pattern, the second intensity, and the second illumination pattern.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: February 25, 2020
    Assignee: The Regents of the University of California
    Inventors: Zhaowei Liu, Eric Huang, Qian Ma
  • Publication number: 20190339418
    Abstract: The document discloses transferrable hyperbolic metamaterial particles (THMMP) that display broadband, selective, omnidirectional absorption and can be transferred to secondary substrates, allowing enhanced flexibility and selective transmission. A device having metamaterial nanostructures includes a substrate and metamaterial nanostructures engaged to the substrate to form an optical layer to interact with light incident to the optical layer to exhibit optical reflection or absorption or transmission that is substantially uniform over a spectral range of different optical wavelengths associated with materials and structural features of the metamaterial nanostructures, each metamaterial nanostructure including different material layers that are interleaved to form a multi-layer nanostructure.
    Type: Application
    Filed: January 23, 2018
    Publication date: November 7, 2019
    Inventors: Donald J. Sirbuly, Zhaowei Liu, Conor Riley
  • Patent number: 10371416
    Abstract: Techniques, systems, devices and materials are disclosed for spectrally selective coatings for optical surfaces having high solar absorptivity, low infrared emissivity, and strong durability at elevated temperatures. In one aspect, a spectrally selective coating includes a substrate formed of a light absorbing material, and a composite material formed over the substrate and including nanoparticles dispersed in a dielectric material, in which the composite material forms a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: August 6, 2019
    Assignee: The Regents of the University of California
    Inventors: Sungho Jin, Renkun Chen, Zhaowei Liu, Tae Kyoung Kim
  • Patent number: 10361336
    Abstract: In one aspect, there is provided an apparatus including a light emitting diode. The apparatus may include a plurality of layers including a substrate layer, a buffer layer disposed on the substrate layer, a charge transport layer, a light emission layer, another charge transport layer, and/or a metamaterial layer. The other charge transport layer may have at least one channel etched into the other charge transport layer leaving a residual thickness of the other charge transport layer between a bottom of the etched channel and the light emission layer. A metamaterial layer may be contained in the at least one channel that is proximate to the residual thickness of the charge transport layer. The metamaterial may include a structure including at least one of a dielectric or a metal. The metamaterial may cause the light emitting diode to operate at higher frequencies and with higher efficiency.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: July 23, 2019
    Assignee: The Regents of the University of California
    Inventors: Zhaowei Liu, Danyong Dylan Lu
  • Publication number: 20190155067
    Abstract: A metallic quantum well may be formed by interposing a layer of metallic well material two layers of barrier material. Two or more metallic quantum wells may be combined to form a coupled metallic quantum well. The absorption spectrum and the emission spectrum of the coupled metallic quantum well may be tuned by at least adjusting the dimensions of the individual metallic quantum wells and/or the materials forming the metallic quantum wells. The metallic quantum well and/or the coupled metallic quantum well may exhibit sufficient nonlinearity even at a miniaturized scale. As such, the metallic quantum well and/or coupled metallic quantum well may be used for a variety of on-chip applications including, for example, as part of an on-chip pulse limiter, an on-chip super-continuum generator, and/or the like.
    Type: Application
    Filed: October 10, 2018
    Publication date: May 23, 2019
    Inventors: Zhaowei Liu, Yuzhe Xiao, Haoliang Qian
  • Publication number: 20190056269
    Abstract: A spectrometry system may include an etalon array having a first etalon and a second etalon. The first etalon may be configured to process light to at least generate a first transmission pattern. The first transmission pattern may have at least a first transmission peak corresponding to a first wavelength in an original spectrum of the light. The second etalon may be configured to process the light to at least generate a second transmission pattern. The second transmission pattern may have at least a second transmission peak corresponding to a second wavelength in the original spectrum of the light. The first etalon may have a different thickness than the second etalon in order for the first transmission pattern to have at least one transmission peak that is at a different wavelength than the second transmission pattern. The first transmission pattern and the second transmission pattern may enable a reconstruction the original spectrum of the light.
    Type: Application
    Filed: February 24, 2017
    Publication date: February 21, 2019
    Inventors: Zhaowei Liu, Qian Ma, Eric Huang
  • Publication number: 20190035967
    Abstract: In one aspect, there is provided an apparatus including a light emitting diode. The apparatus may include a plurality of layers including a substrate layer, a buffer layer disposed on the substrate layer, a charge transport layer, a light emission layer, another charge transport layer, and/or a metamaterial layer. The other charge transport layer may have at least one channel etched into the other charge transport layer leaving a residual thickness of the other charge transport layer between a bottom of the etched channel and the light emission layer. A metamaterial layer may be contained in the at least one channel that is proximate to the residual thickness of the charge transport layer. The metamaterial may include a structure including at least one of a dielectric or a metal. The metamaterial may cause the light emitting diode to operate at higher frequencies and with higher efficiency.
    Type: Application
    Filed: November 28, 2017
    Publication date: January 31, 2019
    Inventors: Zhaowei Liu, Danyong Dylan Lu
  • Patent number: 10184051
    Abstract: Methods, systems, and devices are disclosed for fabricating and implementing optically absorbing coatings. In one aspect, an optically selective coating includes a substrate formed of a solar energy absorbing material, and a nanostructure material formed over the substrate as a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum. A concentrating solar power (CSP) system includes heat transfer fluids (HTFs); thermal energy storage system (TES); and solar receivers in communication with HTFs and including a light absorbing coating layer based on cobalt oxide nanoparticles.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: January 22, 2019
    Assignee: The Regents of the University of California
    Inventors: Sungho Jin, Renkun Chen, Zhaowei Liu, Jaeyun Moon, Tae Kyoung Kim, Bryan Van Saders
  • Publication number: 20180045938
    Abstract: An apparatus for compressive sensing may include a filter array, a detector, and a reconstruction engine. The filter array may be configured to generate a first illumination pattern in response to a first wavelength of light and a second illumination pattern in response to a second wavelength of light. The first illumination pattern and the second illumination pattern may be projected onto an object. The detector may be configured to determine a first intensity of a first light emitted by the object in response to the first illumination pattern and a second intensity of a second light emitted by the object in response to the second illumination pattern. The reconstruction engine may be configured to generate an image of the object based at least on the first intensity, the first illumination pattern, the second intensity, and the second illumination pattern.
    Type: Application
    Filed: August 11, 2017
    Publication date: February 15, 2018
    Inventors: Zhaowei Liu, Eric Huang, Qian Ma
  • Patent number: 9865768
    Abstract: In one aspect, there is provided an apparatus including a light emitting diode. The apparatus may include a plurality of layers including a substrate layer, a buffer layer disposed on the substrate layer, a charge transport layer, a light emission layer, another charge transport layer, and/or a metamaterial layer. The other charge transport layer may have at least one channel etched into the other charge transport layer leaving a residual thickness of the other charge transport layer between a bottom of the etched channel and the light emission layer. A metamaterial layer may be contained in the at least one channel that is proximate to the residual thickness of the charge transport layer. The metamaterial may include a structure including at least one of a dielectric or a metal. The metamaterial may cause the light emitting diode to operate at higher frequencies and with higher efficiency.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: January 9, 2018
    Assignee: The Regents Of The University of California
    Inventors: Zhaowei Liu, Danyong Dylan Lu
  • Publication number: 20170179334
    Abstract: In one aspect, there is provided an apparatus including a light emitting diode. The apparatus may include a plurality of layers including a substrate layer, a buffer layer disposed on the substrate layer, a charge transport layer, a light emission layer, another charge transport layer, and/or a metamaterial layer. The other charge transport layer may have at least one channel etched into the other charge transport layer leaving a residual thickness of the other charge transport layer between a bottom of the etched channel and the light emission layer. A metamaterial layer may be contained in the at least one channel that is proximate to the residual thickness of the charge transport layer. The metamaterial may include a structure including at least one of a dielectric or a metal. The metamaterial may cause the light emitting diode to operate at higher frequencies and with higher efficiency.
    Type: Application
    Filed: March 27, 2015
    Publication date: June 22, 2017
    Inventors: Zhaowei LIU, Danyong Dylan LU
  • Publication number: 20170073530
    Abstract: Methods, systems, and devices are disclosed for fabricating and implementing optically absorbing coatings. In one aspect, an optically selective coating includes a substrate formed of a solar energy absorbing material, and a nanostructure material formed over the substrate as a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum. A concentrating solar power (CSP) system includes heat transfer fluids (HTFs); thermal energy storage system (TES); and solar receivers in communication with HTFs and including a light absorbing coating layer based on cobalt oxide nanoparticles.
    Type: Application
    Filed: March 13, 2015
    Publication date: March 16, 2017
    Inventors: Sungho Jin, Renkun Chen, Zhaowei Liu, Jaeyun Moon, Tae Kyoung Kim, Bryan Van Saders
  • Patent number: 9304234
    Abstract: Plasmonic condensers for generating surface plasmon at an evanescent wave surface can include a substrate layer, a metal layer comprising the evanescent wave surface; and a media layer disposed between the metal layer and the substrate layer. The media layer can be active or passive and can include a source of radiation that interacts with the metal layer to create surface plasmons that are not substantially optically detectable as far field radiation until an interfering object is brought into proximity with the evanescent wave surface. When an interfering object such as a sample or specimen is brought into proximity with the evanescent wave surface, it causes coupling of at least some of the surface plasmons into propagating radiation detectable by an objective lens. Systems, methods, and the like are disclosed, as are features of a plasmonic meta-materials illuminator.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: April 5, 2016
    Assignee: The Regents of the University of California
    Inventors: Zhaowei Liu, Feifei Wei
  • Patent number: 9151891
    Abstract: Devices based on metamaterial structures to guide and manipulate light, other electromagnetic radiation and acoustic waves. For example, a lens can include a metamaterial structure comprising nano structures of metallic and dielectric materials; and a plasmonic waveguide coupler formed over the metamaterial structure for coupling electromagnetic radiation to or from metamaterial structure. The metamaterial structure has an anisotropic structure and the plasmonic waveguide coupler is structured to include metal and non-metal parts to support surface plasmon polaritons and to cause different phase delays at different locations of an interface with the metamaterial structure in a way that the metamaterial structure and the plasmonic waveguide coupler effect a lens for performing a Fourier transform of the electromagnetic radiation coupled between the metamaterial structure and the plasmonic waveguide coupler.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: October 6, 2015
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Changbao Ma, Zhaowei Liu
  • Publication number: 20150107582
    Abstract: Techniques, systems, devices and materials are disclosed for spectrally selective coatings for optical surfaces having high solar absorptivity, low infrared emissivity, and strong durability at elevated temperatures. In one aspect, a spectrally selective coating includes a substrate formed of a light absorbing material, and a composite material formed over the substrate and including nanoparticles dispersed in a dielectric material, in which the composite material forms a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum.
    Type: Application
    Filed: May 6, 2013
    Publication date: April 23, 2015
    Inventors: Sungho Jin, Renkun Chen, Zhaowei Liu, Tae Kyoung Kim
  • Patent number: 8836948
    Abstract: Disclosed are systems, apparatus, methods and devices, including a method that includes generating two or more sequential surface plasmon interference patterns, at least one of the two or more sequential surface plasmon interference patterns being different from another of the two or more sequential surface plasmon interference patterns, and capturing respective images of a specimen resulting from the interference patterns. Also disclosed is a method that includes generating two or more sequential optical interference patterns, at least one of the two or more sequential optical interference patterns being different from another of the interference patterns, and removing from each of the generated interference patterns, using a beam stopper, a corresponding zero-order diffraction light component included in the respective generated patterns to obtain resultant corresponding two or more sequential optical interference patterns, directed at a specimen, with missing respective zero-order light components.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: September 16, 2014
    Assignee: The Regents of the University of California
    Inventor: Zhaowei Liu
  • Publication number: 20120328240
    Abstract: Devices based on metamaterial structures to guide and manipulate light, other electromagnetic radiation and acoustic waves. For example, a lens can include a metamaterial structure comprising nano structures of metallic and dielectric materials; and a plasmonic waveguide coupler formed over the metamaterial structure for coupling electromagnetic radiation to or from metamaterial structure. The metamaterial structure has an anisotropic structure and the plasmonic waveguide coupler is structured to include metal and non-metal parts to support surface plasmon polaritons and to cause different phase delays at different locations of an interface with the metamaterial structure in a way that the metamaterial structure and the plasmonic waveguide coupler effect a lens for performing a Fourier transform of the electromagnetic radiation coupled between the metamaterial structure and the plasmonic waveguide coupler.
    Type: Application
    Filed: February 14, 2011
    Publication date: December 27, 2012
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Changbao Ma, Zhaowei Liu
  • Publication number: 20120229891
    Abstract: Plasmonic condensers for generating surface plasmon at an evanescent wave surface can include a substrate layer, a metal layer comprising the evanescent wave surface; and a media layer disposed between the metal layer and the substrate layer. The media layer can be active or passive and can include a source of radiation that interacts with the metal layer to create surface plasmons that are not substantially optically detectable as far field radiation until an interfering object is brought into proximity with the evanescent wave surface. When an interfering object such as a sample or specimen is brought into proximity with the evanescent wave surface, it causes coupling of at least some of the surface plasmons into propagating radiation detectable by an objective lens. Systems, methods, and the like are disclosed, as are features of a plasmonic meta-materials illuminator.
    Type: Application
    Filed: March 12, 2012
    Publication date: September 13, 2012
    Inventors: Zhaowei Liu, Feifei Wei