Patents by Inventor Alexander Y. Zhu

Alexander Y. Zhu 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).

  • Control of diffraction artifacts in augmented reality display using view control layer
    Patent number: 12066631
    Abstract: Techniques are described in which a view control layer is optically coupled to a waveguide having one or more diffraction structures. The view control layer selectively prevents light rays from interfacing with at least one diffraction structure of the waveguide based on a respective angle of incidence at which the light rays encounter the view control layer. In various embodiments, the view control layer may include a light control film, a polarization stack, and/or a dielectric stack angular filter.
    Type: Grant
    Filed: January 13, 2023
    Date of Patent: August 20, 2024
    Assignee: GOOGLE LLC
    Inventors: Thomas Hoekman, Joseph Daniel Lowney, Alexander Y. Zhu
  • CONTROL OF DIFFRACTION ARTIFACTS IN AUGMENTED REALITY DISPLAY USING VIEW CONTROL LAYER
    Publication number: 20240241374
    Abstract: Techniques are described in which a view control layer is optically coupled to a waveguide having one or more diffraction structures. The view control layer selectively prevents light rays from interfacing with at least one diffraction structure of the waveguide based on a respective angle of incidence at which the light rays encounter the view control layer. In various embodiments, the view control layer may include a light control film, a polarization stack, and/or a dielectric stack angular filter.
    Type: Application
    Filed: January 13, 2023
    Publication date: July 18, 2024
    Inventors: Thomas Hoekman, Joseph Daniel Lowney, Alexander Y. Zhu
  • Achromatic metalens and metalens with reverse chromatic dispersion
    Patent number: 10408416
    Abstract: An optical device includes a substrate, a reflective layer disposed over the substrate, and a metalens disposed over the reflective layer. The metalens includes a plurality of nanopillars, the plurality of nanopillars together specifying a phase profile such that the metalens has a focal length that is substantially constant over a wavelength range of an incident light of about 490 nm to about 550 nm.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: September 10, 2019
    Assignee: PRESIDENT AND FELLOWS OF HARVARD COLLEGE
    Inventors: Mohammadreza Khorasaninejad, Zhujun Shi, Alexander Y. Zhu, Wei Ting Chen, Vyshakh Sanjeev, Federico Capasso
  • ACHROMATIC METALENS AND METALENS WITH REVERSE CHROMATIC DISPERSION
    Publication number: 20180216797
    Abstract: An optical device includes a substrate, a reflective layer disposed over the substrate, and a metalens disposed over the reflective layer. The metalens includes a plurality of nanopillars, the plurality of nanopillars together specifying a phase profile such that the metalens has a focal length that is substantially constant over a wavelength range of an incident light of about 490 nm to about 550 nm.
    Type: Application
    Filed: January 31, 2018
    Publication date: August 2, 2018
    Applicant: PRESIDENT AND FELLOWS OF HARVARD COLLEGE
    Inventors: Mohammadreza Khorasaninejad, Zhujun Shi, Alexander Y. Zhu, Wei Ting Chen, Vyshakh Sanjeev, Federico Capasso