Search Patents
  • Optical isolation created by indirect interband photonic transitions
    Patent number: 8639064
    Abstract: The refractive index of the at least one photonic structure having two separate photonic bands is modulated, so that light supplied to the at least one photonic structure and initially in one of the two photonic bands of the traveling along a forward direction in the at least one photonic structure is converted to light in a second one of the photonic bands, and light in the one photonic band traveling along a backward direction opposite to the forward direction in the at least one photonic structure is not converted and remains in the one photonic band, achieving non-reciprocity.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: January 28, 2014
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Zongfu Yu, Shanhui Fan
  • OPTICAL FIBER WITH A CORE RING
    Publication number: 20090175584
    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 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 20, 2009
    Publication date: July 9, 2009
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J.F. Digonnet, Vinayak Dangui
  • Optical fiber
    Patent number: 8428412
    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 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: Grant
    Filed: January 20, 2009
    Date of Patent: April 23, 2013
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet, Vinayak Dangui
  • Systems and Methods for Deterministic Photonic Quantum Computing in a Synthetic Time Dimension
    Publication number: 20230376817
    Abstract: Many embodiments describe a scalable scheme for performing quantum computation in a synthetic time dimension which uses a single coherently controlled atom. Quantum operations applied to the atomic qubit can be teleported onto the photonic qubits via projective measurement, and arbitrary quantum circuits can be compiled into a sequence of these teleported gates. The synthetic time dimension can negate the need for many identical quantum emitters to be integrated into a photonic circuit, and the single atom may provide effective all-to-all connectivity between photonic qubits.
    Type: Application
    Filed: October 4, 2021
    Publication date: November 23, 2023
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Ben Bartlett, Avik Dutt, Shanhui Fan
  • Optoelectronic Semiconductor Device and Method of Fabrication
    Publication number: 20110095389
    Abstract: An optoelectronic device comprising an optically active layer that includes a plurality of domes is presented. The plurality of domes is arrayed in two dimensions having a periodicity in each dimension that is less than or comparable with the shortest wavelength in a spectral range of interest. By virtue of the plurality of domes, the optoelectronic device achieves high performance. A solar cell having high energy-conversion efficiency, improved absorption over the spectral range of interest, and an improved acceptance angle is presented as an exemplary device.
    Type: Application
    Filed: October 21, 2010
    Publication date: April 28, 2011
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Yi Cui, Jia Zhu, Ching-Mei Hsu, Shanhui Fan, Zongfu Yu
  • SYSTEMS AND METHODS INVOLVING WIRELESS POWER TRANSFER USING AN AMPLIFIER WITH GAIN AND FEEDBACK
    Publication number: 20220385107
    Abstract: In certain examples, methods and semiconductor structures are directed to an apparatus including source circuitry configured to provide power to other circuitry, with the source circuitry including amplification circuitry (e.g., with a power-switching output) and a source resonator. The amplification circuitry is to provide power to the source resonator with a gain that is dependent on a coupling rate between the source circuitry and other external-receiving circuitry. The source circuitry is also to offset phase delay caused by the amplifier. In operation, the source resonator generates a magnetic field in response to the power, for highly-efficient wirelessly transfer of the power to the other circuitry.
    Type: Application
    Filed: October 23, 2020
    Publication date: December 1, 2022
    Inventors: Sid Assawaworrarit, Shanhui Fan
  • Space Charge Trap-Assisted Recombination Suppressing Layer for Low-Voltage Diode Operation
    Publication number: 20210408318
    Abstract: Shockley-Read-Hall (SRH) generation and/or recombination in heterojunction devices is suppressed by unconventional doping at or near the heterointerface. The effect of this doping is to shift SRH generation and/or recombination preferentially into the wider band gap material of the heterojunction. This reduces total SRH generation and/or recombination in the device by decreasing the intrinsic carrier concentration ni at locations where most of the SRH generation and/or recombination occurs. The physical basis for this effect is that the SRH generation and/or recombination rate tends to decrease as ni around the depletion region decreases, so decreasing the effective ni in this manner is a way to decrease SRH recombination.
    Type: Application
    Filed: June 25, 2021
    Publication date: December 30, 2021
    Inventors: Parthiban Santhanam, Shanhui Fan
  • Isotropic Filters in Spatial Frequency Domain by a Photonic Crystal Slab
    Publication number: 20210278566
    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: February 22, 2021
    Publication date: September 9, 2021
    Inventors: Cheng Guo, Meng Xiao, Momchil Minkov, Yu Shi, Shanhui Fan
  • Nano-electromechanical high-index contrast
    Patent number: 7260287
    Abstract: A nano-electromechanical optical switch includes an input optical waveguide that is provided with an optical signal. At least two output optical waveguides are coupled to the input optical waveguide. The deflection of the input optical waveguide aligns with one of either of the two output optical waveguides so as to allow transmission of the optical signal to one of either of the two output optical waveguides.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: August 21, 2007
    Assignee: Massachusetts Institute of Technology
    Inventors: Solomon Assefa, Reginald E. Bryant, Alexei A. Erchak, Shanhui Fan, Erich P. Ippen, John D. Joannopoulos, Steven G. Johnson, Leslie A. Kolodziejski, Elefterios Lidorikis, Gale S. Petrich, Michelle L. Povinelli
  • SYSTEM AND METHOD FOR USING SLOW LIGHT IN OPTICAL SENSORS
    Publication number: 20110134432
    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 relative movement between the optical waveguide and the at least one optical coupler.
    Type: Application
    Filed: February 11, 2011
    Publication date: June 9, 2011
    Inventors: Matthew A. Terrel, Michel J.F. Digonnet, Shanhui Fan
  • Photonic crystal reflectors/filters and displacement sensing applications
    Publication number: 20040080726
    Abstract: We introduce a mechanically tunable photonic crystal structure consisting of coupled photonic crystal slabs. Using both analytic theory, and first-principles finite-difference time-domain simulations, we demonstrate that the transmission and reflection coefficients for light normally incident upon such structures can be highly sensitive to nano-scale variations in the spacing between the slabs. Moreover, by specifically configuring the photonic crystal structures, the high sensitivity can be preserved in spite of significant fabrication-related disorders. We expect such a structure to play important roles in micro-mechanically tunable optical sensors and filters.
    Type: Application
    Filed: October 8, 2003
    Publication date: April 29, 2004
    Inventors: Wonjoo Suh, M. F. Yanik, Olav Solgaard, Shanhui Fan
  • Slow-light sensor utilizing an optical filter and a narrowband optical source
    Patent number: 9366808
    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: Grant
    Filed: May 28, 2014
    Date of Patent: June 14, 2016
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Shanhui Fan, He Wen, Matthew Terrel
  • Integrated Magneto-Optical Devices for Uni-Directional Optical Resonator Systems
    Publication number: 20080267557
    Abstract: A resonator system comprises an optical resonator that supports one or more pairs of nearly degenerate defect states. One or more magnetic domains comprising at least one gyrotropic material in the optical resonator cause magneto-optical coupling between the two states so that the system lacks time-reversal symmetry. In one embodiment, a single magnetic domain is used that dominates induced magneto-optical coupling between the defect states. The above resonator system may be used together with other components such as waveguides to form circulators, add drop filters, switches and memories.
    Type: Application
    Filed: December 27, 2006
    Publication date: October 30, 2008
    Inventors: Zheng Wang, Shanhui Fan
  • Creating sharp asymmetric lineshapes in microcavity structures
    Patent number: 6819691
    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: Grant
    Filed: January 28, 2002
    Date of Patent: November 16, 2004
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventor: Shanhui Fan
  • STACKED MULTI-FREQUENCY THREE-DIMENSIONAL METASURFACE
    Publication number: 20230324582
    Abstract: A stacked three-dimensional (3D) metasurface includes a first layer with a first kernel configured to apply a first convolution on a first frequency of an incident polarized light, and a second layer with a second kernel different than the first kernel. The second kernel is configured to apply a second convolution different than the first convolution on a second frequency of the incident polarized light and the second frequency is different than the first frequency such that the stack 3D metasurface provides at least two independent convolutions on the incident polarized light.
    Type: Application
    Filed: April 8, 2022
    Publication date: October 12, 2023
    Applicants: Toyota Motor Engineering & Manufacturing North America, Inc., The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shanhui Fan, Ercan Mehmet Dede, Sean P. Rodrigues, Haiwen Wang
  • Simultaneous measurements of gradients in optical networks
    Publication number: 20220327369
    Abstract: Improved training of optical neural networks is provided. In one example: 1) we choose input and target vectors, we program those into an input vector generator and a measurement unit, respectively, we turn on the optical input source power, and we monitor the electrical signal representing the cost function. 2) we can then modulate two or more controllable elements inside the optical network at different frequencies and look for the size and sign of the corresponding distinct AC variations in the measured cost function, simultaneously giving us the gradients with respect to each element.
    Type: Application
    Filed: September 9, 2020
    Publication date: October 13, 2022
    Inventors: Shanhui Fan, Tyler William Hughes, David A.B. Miller, Sunil K. Pai, Olav Solgaard, Ian A.D. Williamson
  • Guided resonance dielectric filter systems
    Publication number: 20060050394
    Abstract: We theoretically introduce a new type of optical all-pass filter based on guided resonance in coupled photonic crystal slabs. The filter exhibits near-complete transmission for both on- and off-resonant frequencies and yet generates large resonant group delay. We further show that such a filter can be mechanically switched into a flat-top band rejection filter. We also show that a single photonic crystal slab can also function either as optical all-pass transmission or flattop reflection filter for normally incident light. Both filter functions are synthesized by designing the spectral properties of guided resonance in the slab. The structure is extremely compact along the vertical direction.
    Type: Application
    Filed: September 8, 2004
    Publication date: March 9, 2006
    Inventors: Wonjoo Suh, Olav Solgaard, Shanhui Fan
  • Photonic Crystal Reflectors / Filters and Displacement Sensing Applications
    Publication number: 20060280403
    Abstract: We introduce a mechanically tunable photonic crystal structure consisting of coupled photonic crystal slabs. Using both analytic theory, and first-principles finite-difference time-domain simulations, we demonstrate that the transmission and reflection coefficients for light normally incident upon such structures can be highly sensitive to nano-scale variations in the spacing between the slabs. Moreover, by specifically configuring the photonic crystal structures, the high sensitivity can be preserved in spite of significant fabrication-related disorders. We expect such a structure to play important roles in micro-mechanically tunable optical sensors and filters.
    Type: Application
    Filed: August 15, 2006
    Publication date: December 14, 2006
    Applicant: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Wonjoo Suh, Mehmet Yanik, Olav Solgaard, Shanhui Fan
  • System and method for using slow light in optical sensors
    Patent number: 8300231
    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 relative movement between the optical waveguide and the at least one optical coupler.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: October 30, 2012
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Matthew A. Terrel, Michel J. F. Digonnet, Shanhui Fan
  • Frequency-domain arbitrary linear transformations for photons
    Publication number: 20230324607
    Abstract: One or more optical resonators are coupled to an optical waveguide in sequence. Each of the resonators includes a corresponding modulator. A signal controller is configured to electrically drive each modulator with a corresponding composite electrical signal. Each composite electrical signal includes two or more frequency components of a frequency comb defined by the one or more resonators. The result of this configuration is that an input-output relation between an input of the waveguide and an output of the waveguide is a linear transformation defined by the composite electrical signals using frequencies of the frequency comb as a basis. Such linear transformations can be reciprocal or non-reciprocal, unitary or non-unitary.
    Type: Application
    Filed: August 31, 2021
    Publication date: October 12, 2023
    Inventors: Siddharth Buddhiraju, Avik Dutt, Momchil Minkov, Ian A.D. Williamson, Shanhui Fan
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