Patents by Inventor Hansuek LEE

Hansuek LEE 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: 20210109096
    Abstract: Disclosed herein is a method of determining a concentration of a subject based on fraction bound measurement. The method of determining a concentration of a subject based on fraction bound measurement may include fixing a ligand to a surface of an optical device, measuring a fraction bound of a subject to be detected based on an optical signal when the subject reacts to the ligand fixed to the surface of the optical device, and determining a relative value of a concentration of the subject based on a ratio of measured values of the fraction bounds of the subject and a reference signal.
    Type: Application
    Filed: June 22, 2020
    Publication date: April 15, 2021
    Inventors: Hansuek Lee, Yeseul Kim
  • Publication number: 20200319406
    Abstract: The present invention relates to an optical device comprising a first sub-chip and a second sub-chip flipped over on the first sub-chip. The first sub-chip includes a first substrate, a first lower cladding pattern on a first surface of the first substrate, and a first core layer on the first lower cladding pattern. The second sub-chip includes a second substrate, a second lower cladding pattern on a second surface of the second substrate, and a second core layer on the second lower cladding pattern. The first surface of the first substrate faces the second surface of the second substrate. The first lower cladding pattern has a first top surface parallel to the first surface and a first sidewall inclined to the first surface. The first core layer includes a first core part on the first top surface and a first side part on the first sidewall.
    Type: Application
    Filed: April 3, 2020
    Publication date: October 8, 2020
    Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Hansuek LEE, Daegon KIM, Sangyoon HAN, Joonhyuk HWANG
  • Patent number: 10009103
    Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2?N2fM. The optical detector generates a beat note at (v2?N2fM)?(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: June 26, 2018
    Assignees: CALIFORNIA INSTITUTE OF TECHNOLOGY, THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
    Inventors: Kerry Vahala, Scott Diddams, Jiang Li, Xu Yi, Hansuek Lee
  • Publication number: 20170012705
    Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2?N2fM. The optical detector generates a beat note at (v2?N2fM)?(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.
    Type: Application
    Filed: August 11, 2016
    Publication date: January 12, 2017
    Inventors: Kerry VAHALA, Scott DIDDAMS, Jiang LI, Xu YI, Hansuek LEE
  • Patent number: 9450673
    Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2?N2fM. The optical detector generates a beat note at (v2?N2fM)?(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: September 20, 2016
    Assignees: CALIFORNIA INSTITUTE OF TECHNOLOGY, THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE, THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY
    Inventors: Kerry Vahala, Scott Diddams, Jiang Li, Xu Yi, Hansuek Lee
  • Publication number: 20160190769
    Abstract: A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 ?W. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz2/Hz (measured with the coherent laser at a power level of about 400 ?W) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.
    Type: Application
    Filed: February 8, 2016
    Publication date: June 30, 2016
    Inventors: Jiang LI, Hansuek LEE, Tong CHEN, Kerry VAHALA
  • Patent number: 9293887
    Abstract: A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 ?W. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz2/Hz (measured with the coherent laser at a power level of about 400 ?W) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: March 22, 2016
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Jiang Li, Hansuek Lee, Tong Chen, Kerry Vahala
  • Publication number: 20150236784
    Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2?N2fM. The optical detector generates a beat note at (v2?N2fM)?(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.
    Type: Application
    Filed: January 26, 2015
    Publication date: August 20, 2015
    Inventors: Kerry Vahala, Scott Diddams, Jiang Li, Xu Yi, Hansuek Lee
  • Patent number: 9042003
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: May 26, 2015
    Assignee: California Institute of Technology
    Inventors: Jiang Li, Hansuek Lee, Tong Chen, Kerry Vahala
  • Publication number: 20150092808
    Abstract: A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 ?W. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz2/Hz (measured with the coherent laser at a power level of about 400 ?W) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.
    Type: Application
    Filed: June 15, 2012
    Publication date: April 2, 2015
    Inventors: Jiang LI, Hansuek LEE, Tong CHEN, Kerry VAHALA
  • Publication number: 20150029579
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Application
    Filed: October 13, 2014
    Publication date: January 29, 2015
    Inventors: Jiang LI, Hansuek LEE, Tong CHEN, Kerry VAHALA
  • Patent number: 8917444
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: December 23, 2014
    Assignee: California Institute of Technology
    Inventors: Jiang Li, Hansuek Lee, Tong Chen, Kerry Vahala
  • Patent number: 8848760
    Abstract: An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length. The RMS resonance frequency fluctuation is less than or about equal to 100 Hz. The Q-factor can be greater than or about equal to 108. The optical waveguide can exhibit optical loss less than or about equal to 0.2 dB/m for propagation of an optical signal along the optical waveguide. The closed loop path can comprise two or more linked spirals greater than or about equal to 1 meter in length and can occupy an area on the waveguide substrate less than or about equal to 5 cm2.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 30, 2014
    Assignee: California Institute of Technology
    Inventors: Kerry Vahala, Tong Chen, Hansuek Lee, Myoung-Gyun Suh
  • Patent number: 8818146
    Abstract: A method of manufacturing a waveguide eliminates a prior art reflow step and introduces certain new steps that permit fabricating of an ultra-low loss waveguide element on a silicon chip. The ultra-low loss waveguide element may be adapted to fabricate a number of devices, including a wedge resonator and a ultra-low loss optical delay line having an extended waveguide length.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: August 26, 2014
    Assignee: California Institute of Technology
    Inventors: Kerry Vahala, Hansuek Lee, Tong Chen, Jiang Li
  • Publication number: 20120320448
    Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.
    Type: Application
    Filed: June 15, 2012
    Publication date: December 20, 2012
    Inventors: Jiang LI, Hansuek LEE, Tong CHEN, Kerry VAHALA
  • Publication number: 20120321245
    Abstract: A method of manufacturing a waveguide eliminates a prior art reflow step and introduces certain new steps that permit fabricating of an ultra-low loss waveguide element on a silicon chip. The ultra-low loss waveguide element may be adapted to fabricate a number of devices, including a wedge resonator and a ultra-low loss optical delay line having an extended waveguide length.
    Type: Application
    Filed: June 12, 2012
    Publication date: December 20, 2012
    Inventors: Kerry VAHALA, Hansuek LEE, Tong CHEN, Jiang LI