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  • Creating sharp asymmetric lineshapes in microcavity structures
    Publication number: 20030142719
    Abstract: We disclose a new structure that allows the creation of sharp and asymmetric lineshapes in optical microcavity systems. In this structure, the response function can vary from 0% to 100% in a frequency range that is narrower than the full width of the resonance itself. Therefore, an optical switch, based upon this structure, may require far less frequency shift to operate, compared with conventional microcavity-based structures. This method may also be used to improve the sensitivity of optical sensors based upon microcavity structures.
    Type: Application
    Filed: January 28, 2002
    Publication date: July 31, 2003
    Inventor: Shanhui Fan
  • MULTI-STACK GRAPHENE STRUCTURE AND DEVICE INCLUDING THE SAME
    Publication number: 20180120595
    Abstract: A multi-stack graphene structure includes a graphene stack that includes graphene layers including amorphous graphene and thin film dielectric layers. The graphene layers include amorphous graphene. The graphene layers and the thin dielectric layers are alternately stacked on one another. The multi-stack graphene structure also includes an electric field former configured to apply an electric field to the graphene layers.
    Type: Application
    Filed: November 2, 2017
    Publication date: May 3, 2018
    Applicants: SAMSUNG ELECTRONICS CO., LTD., THE BOARD OF TRUSTEES OF THE LELAND STANFORD JR. UNIVERSITY
    Inventors: Wonjae JOO, Juhyung KANG, Soojin KIM, Mark L. BRONGERSMA, Shanhui FAN
  • OPTICAL FIBER WITH A CORE RING
    Publication number: 20080112678
    Abstract: An optical fiber includes a cladding with a material having a first refractive index and a pattern of regions formed therein. Each of the regions has a second refractive index lower than the first refractive index. The optical fiber further includes a core region and a core ring surrounding the core region and having an inner perimeter, an outer perimeter, and a thickness between the inner perimeter and the outer perimeter. The thickness is sized to reduce the number of ring surface modes supported by the core ring.
    Type: Application
    Filed: January 8, 2008
    Publication date: May 15, 2008
    Inventors: Hyang Kim, Shanhui Fan, Gordon Kino, Jonghwa Shin, Michel Digonnet, Vinayak Dangui
  • MULTI-STACK GRAPHENE STRUCTURE AND DEVICE INCLUDING THE SAME
    Publication number: 20190384074
    Abstract: A multi-stack graphene structure includes a graphene stack that includes graphene layers including amorphous graphene and thin film dielectric layers. The graphene layers include amorphous graphene. The graphene layers and the thin dielectric layers are alternately stacked on one another. The multi-stack graphene structure also includes an electric field former configured to apply an electric field to the graphene layers.
    Type: Application
    Filed: August 30, 2019
    Publication date: December 19, 2019
    Applicants: SAMSUNG ELECTRONICS CO., LTD., THE BOARD OF TRUSTEES OF THE LELAND STANFORD JR. UNIVERSITY
    Inventors: Wonjae JOO, Juhyung KANG, Soojin KIM, Mark L. BRONGERSMA, Shanhui FAN
  • Thermal extraction using radiation
    Patent number: 10544999
    Abstract: In one embodiment of the present disclosure, a device is disclosed comprising a macroscopic thermal body and an extraction structure that is electromagnetically-coupled to the thermal emitting area of the thermal body. The macroscopic thermal body having a thermal emitting area, and the extraction structure configured and arranged to facilitate emission from, or receipt to the thermal emitting area that exceeds a theoretical, Stefan-Boltzmann, emission limit for a blackbody having the same thermal emitting area as the thermal body.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 28, 2020
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Zongfu Yu, Nicholas Sergeant, Torbjorn Skauli, Gang Zhang, Hailiang Wang, Shanhui Fan
  • Multi-stack graphene structure and device including the same
    Patent number: 10816828
    Abstract: A multi-stack graphene structure includes a graphene stack that includes graphene layers including amorphous graphene and thin film dielectric layers. The graphene layers include amorphous graphene. The graphene layers and the thin dielectric layers are alternately stacked on one another. The multi-stack graphene structure also includes an electric field former configured to apply an electric field to the graphene layers.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: October 27, 2020
    Assignees: SAMSUNG ELECTRONICS CO., LTD., THE BOARD OF TRUSTEES OF THE LELAND STANFORD JR. UNIVERSITY
    Inventors: Wonjae Joo, Juhyung Kang, Soojin Kim, Mark L. Brongersma, Shanhui Fan
  • Mach-Zehnder interferometer using photonic band gap crystals
    Patent number: 6917431
    Abstract: A photonic crystal optical switch having a periodic dielectric structure including at least one input waveguide. First and second waveguide arms branch from the input waveguide in which the relative optical path lengths of electromagnetic radiation within the arms are controlled by stimuli. At least one output waveguide that combines the electromagnetic radiation propagating within the first and second waveguide arms.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: July 12, 2005
    Assignee: Massachusetts Institute of Technology
    Inventors: Marin Soljacic, Shanhui Fan, Mihai Ibanescu, Steven G. Johnson, John D. Joannopoulos
  • Dielectric waveguide with transverse index variation that support a zero group velocity mode at a non-zero longitudinal wavevector
    Patent number: 6909729
    Abstract: Optical components including a laser based on a dielectric waveguide extending along a waveguide axis and having a refractive index cross-section perpendicular to the waveguide axis, the refractive index cross-section supporting an electromagnetic mode having a zero group velocity for a non-zero wavevector along the waveguide axis.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: June 21, 2005
    Assignee: Massachusetts Institute of Technology
    Inventors: Mihai Ibanescu, John D. Joannopoious, Yoel Fink, Steven G. Johnson, Shanhui Fan
  • SYSTEM AND METHOD FOR USING SLOW LIGHT IN OPTICAL SENSORS
    Publication number: 20090059238
    Abstract: An optical sensor includes at least one optical coupler and an optical waveguide in optical communication with the at least one optical coupler. The optical waveguide is configured to receive a first optical signal from the at least one optical coupler. The first optical signal has a group velocity and a phase velocity while propagating through at least a portion of the optical waveguide, the group velocity less than the phase velocity. An interference between the first optical signal and a second optical signal is affected by perturbations to at least a portion of the optical sensor.
    Type: Application
    Filed: June 13, 2008
    Publication date: March 5, 2009
    Inventors: Matthew A. Terrel, Michel J.F. Digonnet, Shanhui Fan
  • Adaptive optical signal processing with multimode waveguides
    Patent number: 7509002
    Abstract: Optical signals are passed in an optical medium using an approach that facilitates the mitigation of interference. According to an example embodiment, a filtering-type approach is used with an optical signal conveyed in an optical fiber, such as a multimode fiber (MMF) or a multimode waveguide. Adaptive spatial domain signal processing, responsive to a feedback signal indicative of data conveyed in the multimode waveguide, is used to mitigate interference in optical signals conveyed in the multimode waveguide.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: March 24, 2009
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Joseph M. Kahn, Mark A. Horowitz, Olav Solgaard, Shanhui Fan
  • Tunable chromatic dispersion compensation
    Patent number: 7190853
    Abstract: A system for dispersion compensation is provided including a plurality of optical cavities with each including a specific resonant frequency and resonant linewidth. At least one coupling element interconnects the optical cavities. The at least one coupling element defines the coupling strength between the cavities. The optical cavities are interconnected with the at least one coupled element that forms a multi-cavity structure. The multi-cavity structure generates appropriate dispersion properties for dispersion compensation purposes.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: March 13, 2007
    Assignee: Massachusetts Institute of Technology
    Inventors: John D. Joannopoulos, Shanhui Fan, Michal Lispon, Kevin M. Chen, Lionel C. Kimerling
  • Stopping and time reversing light in a waveguide with an all-optical system
    Publication number: 20060115211
    Abstract: We introduce a new all-optical mechanism that can compress the bandwidth of light pulses to absolute zero, and bring them to a complete stop. The mechanism can be realized in a system consisting of a waveguide side-coupled to tunable resonators, which generates a photonic band structure that represents a classical analogue of the Electromagnetically Induced Transparency. The same system can also achieve a time-reversal operation. We demonstrate the operation of such a system by finite-difference time-domain simulations of an implementation in photonic crystals.
    Type: Application
    Filed: November 30, 2004
    Publication date: June 1, 2006
    Inventors: Mehmet Fatih Yanik, Wonjoo Suh, Zheng Wang, Shanhui Fan
  • Methods and apparatuses for wireless transfer of power
    Patent number: 10931146
    Abstract: Various embodiments are directed to apparatuses and methods related to source circuitry that provide power to other circuitry. The source circuitry including gain circuitry and a source resonator. The gain circuitry provide powers to the source resonator with a gain that is dependent on a coupling rate between the source circuitry and other circuitry. The source resonator is coupled to the gain circuitry and generates a magnetic field in response to the power. The source circuitry is configured and arranged to wirelessly transfer the power to the other circuitry via the magnetic field.
    Type: Grant
    Filed: February 19, 2018
    Date of Patent: February 23, 2021
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shanhui Fan, Sid Assawaworrarit, Xiaofang Yu
  • Substrate comprising a nanometer-scale projection array
    Patent number: 8318604
    Abstract: A method for forming a substrate comprising nanometer-scale pillars or cones that project from the surface of the substrate is disclosed. The method enables control over physical characteristics of the projections including diameter, sidewall angle, and tip shape. The method further enables control over the arrangement of the projections including characteristics such as center-to-center spacing and separation distance.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: November 27, 2012
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Yi Cui, Jia Zhu, Ching-Mei Hsu, Stephen T. Connor, Zongfu Yu, Shanhui Fan, George Burkhard
  • Adaptive optical signal processing with multimode waveguides
    Patent number: 7844144
    Abstract: Optical signals are passed in an optical medium using an approach that facilitates the mitigation of interference. According to an example embodiment, a filtering-type approach is used with an optical signal conveyed in an optical fiber, such as a multimode fiber (MMF) or a multimode waveguide. Adaptive spatial domain signal processing, responsive to a feedback signal indicative of data conveyed in the multimode waveguide, is used to mitigate interference in optical signals conveyed in the multimode waveguide.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: November 30, 2010
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Joseph M. Kahn, Mark A. Horowitz, Olav Solgaard, Shanhui Fan
  • Multi-stack graphene structure and device including the same
    Patent number: 11067836
    Abstract: A multi-stack graphene structure includes a graphene stack that includes graphene layers including amorphous graphene and thin film dielectric layers. The graphene layers include amorphous graphene. The graphene layers and the thin dielectric layers are alternately stacked on one another. The multi-stack graphene structure also includes an electric field former configured to apply an electric field to the graphene layers.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: July 20, 2021
    Assignees: SAMSUNG ELECTRONICS CO., LTD., THE BOARD OF TRUSTEES OF THE LELAND STANFORD JR. UNIVERSITY
    Inventors: Wonjae Joo, Juhyung Kang, Soojin Kim, Mark L. Brongersma, Shanhui Fan
  • Isotropic Filters in Spatial Frequency Domain by a Photonic Crystal Slab
    Publication number: 20190146120
    Abstract: An isotropic imaging filter is provided that includes a photonic crystal slab, where the photonic crystal slab includes a square lattice of air through holes, a dielectric constant, a thickness (d), a through hole radius (r), and a lattice constant (a), where the square lattice of air holes are separated according to a value of the lattice constant, where the thickness is configured according to d=M(a), where the through hole radii is configured according to r=N(a), where the thickness and the hole radii are configured to generate isotropic bands of guided resonances of an incident image.
    Type: Application
    Filed: November 14, 2018
    Publication date: May 16, 2019
    Inventors: Cheng Guo, Meng Xiao, Momchil Minkov, Yu Shi, Shanhui Fan
  • Illumination and radiative cooling
    Patent number: 9923111
    Abstract: Aspects of the present disclosure are directed to providing and/or controlling electromagnetic radiation. As may be implemented in accordance with one or more embodiments, an apparatus includes a first structure that contains an object, and a second structure that is transparent at solar wavelengths and emissive in the atmospheric electromagnetic radiation transparency window. The second structure operates with the first structure to pass light into the first structure for illuminating the object, and to radiatively cool the object while preserving the object's color.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: March 20, 2018
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shanhui Fan, Aaswath Pattabhi Raman, Linxiao Zhu, Eden Rephaeli
  • SLOW-LIGHT SENSOR UTILIZING AN OPTICAL FILTER AND A NARROWBAND OPTICAL SOURCE
    Publication number: 20140340688
    Abstract: An optical device and a method of using an optical filter are provided. The optical device includes an optical filter and a narrowband optical source. The optical filter has a refractive index that varies along a length of the optical filter. The narrowband optical source is in optical communication with the optical filter and is configured to generate light having a wavelength at or in the vicinity of at least one of a wavelength corresponding to a local transmission maximum and a wavelength corresponding to a maximum slop of the group index spectrum of the optical filter.
    Type: Application
    Filed: May 28, 2014
    Publication date: November 20, 2014
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J.F. Digonnet, Shanhui Fan, He Wen, Matthew Terrel
  • Heat-flux control and solid-state cooling by regulating chemical potential of photons in near-field electromagnetic heat transfer
    Publication number: 20160298882
    Abstract: Solid state near-field radiative cooling from a cold emitter to a hot collector is provided. Two cases are considered. In the first case, the cold emitter is forward biased to drive heat flow from the cold emitter to the hot collector. A surface resonance of the collector is configured to enhance this cooling effect. In the second case, the hot collector is reverse biased to control heat flow from the cold emitter to the hot collector. A surface resonance of the emitter is configured to enhance this cooling effect.
    Type: Application
    Filed: April 11, 2016
    Publication date: October 13, 2016
    Inventors: Kaifeng Chen, Parthiban Santhanam, Sunil Sandhu, Linxiao Zhu, Shanhui Fan
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