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公开(公告)号：US11430937B2
公开(公告)日：2022-08-30
申请号：US17147387
申请日：2021-01-12
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong
Abstract: A tunable oscillator including a Josephson junction. In some embodiments, the tunable oscillator includes a first superconducting terminal, a second superconducting terminal, a graphene channel including a portion of a graphene sheet, and a conductive gate. The first superconducting terminal, the second superconducting terminal, and the graphene channel together may form a Josephson junction having an oscillation frequency, and the conductive gate may be configured, upon application of a voltage across the conductive gate and the graphene channel, to modify the oscillation frequency.
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公开(公告)号：US20180136047A1
公开(公告)日：2018-05-17
申请号：US15869725
申请日：2018-01-12
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong
IPC: G01J5/08
CPC classification number: G01J5/0806 , G01J1/42 , G01J1/44 , G01J5/0803 , G01J5/0818 , G01J5/0837 , G01J5/20 , G01J2005/106 , H01L29/1606
Abstract: A bolometer. In one embodiment a graphene sheet is configured to absorb electromagnetic waves. The graphene sheet has two contacts connected to an amplifier, and a power detector connected to the amplifier. Electromagnetic power in the evanescent electromagnetic waves is absorbed in the graphene sheet, heating the graphene sheet. The power of Johnson noise generated at the contacts is proportional to the temperature of the graphene sheet. The Johnson noise is amplified and the power in the Johnson noise is used as a measure of the temperature of the graphene sheet, and of the amount of electromagnetic wave power absorbed by the graphene sheet.
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公开(公告)号：US20160370232A1
公开(公告)日：2016-12-22
申请号：US14794591
申请日：2015-07-08
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong
CPC classification number: G01J5/0818 , G01J1/42 , G01J1/44 , G01J5/20 , G01J2005/106 , H01L29/1606
Abstract: An infrared bolometer. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. The graphene sheet has two contacts connected to an amplifier, and a power detector connected to the amplifier. Infrared electromagnetic power in the evanescent waves is absorbed in the graphene sheet, heating the graphene sheet. The power of Johnson noise generated at the contacts is proportional to the temperature of the graphene sheet. The Johnson noise is amplified and the power in the Johnson noise is used as a measure of the temperature of the graphene sheet, and of the amount of infrared power propagating in the waveguide.
Abstract translation: 红外辐射热量计 在一个实施例中，配置成透射红外辐射的波导被布置成与石墨烯片相邻并且被配置为使得来自波导的消逝波与石墨烯片重叠。 石墨烯片具有连接到放大器的两个触点和连接到放大器的功率检测器。 湮灭波中的红外电磁功率被石墨烯片吸收，加热石墨烯片。 在接触处产生的约翰逊噪声的功率与石墨烯薄片的温度成比例。 约翰逊噪声被放大，约翰逊噪声中的功率被用作测量石墨烯片的温度以及在波导中传播的红外功率的量。
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公开(公告)号：US20230091882A1
公开(公告)日：2023-03-23
申请号：US17992815
申请日：2022-11-22
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong , Man-Hung Siu , Zhuolin Jiang
Abstract: A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.
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公开(公告)号：US11156502B2
公开(公告)日：2021-10-26
申请号：US16826110
申请日：2020-03-20
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong , Leonardo Ranzani
Abstract: A system for detecting microwave power. In some embodiments, the system includes: a first resonator including a graphene-insulating-superconducting junction; a probe signal source, coupled to the first resonator; and a probe signal analyzer. The probe signal analyzer is configured: to measure a change in amplitude or phase of a probe signal received by the probe signal analyzer from the probe signal source, and to infer, from the change in amplitude or phase, a change in microwave power received by the graphene-insulating-superconducting junction.
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Patent Agency Ranking
公开(公告)号：US20170092834A1
公开(公告)日：2017-03-30
申请号：US15279008
申请日：2016-09-28
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong , Thomas A. Ohki
CPC classification number: H01L39/223 , G01J1/42 , G01J1/44 , G01J5/20 , G01J2001/442 , G01J2001/4446 , H01L29/1606
Abstract: A detector for detecting single photons of infrared radiation or longer wavelength electromagnetic radiation. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. In other embodiments a transmission line or antenna is coupled to the graphene sheet and guides longer-wavelength photons to the graphene sheet. A photon absorbed by the graphene sheet heats the graphene sheet. Part of the graphene sheet is part of the Josephson junction as the weak link, and a constant bias current is driven through the Josephson junction; an increase in the temperature of the graphene sheet results in a decrease in the critical current of the Josephson junction and a voltage pulse in the voltage across the Josephson junction. The voltage pulse is detected by the pulse detector.
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公开(公告)号：US20170038260A1
公开(公告)日：2017-02-09
申请号：US14793418
申请日：2015-07-07
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong
IPC: G01J5/22 , H01L31/0232 , G01J5/08
CPC classification number: G01J5/22 , G01J1/42 , G01J5/0818 , G01J5/20 , G01J5/24 , H01L29/1606 , H01L31/02327
Abstract: A detector for detecting single photons of infrared radiation. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. The graphene sheet has two contacts connected to an amplifier, a power detector, and a pulse detector. An infrared photon absorbed by the graphene sheet from the evanescent waves heats the graphene sheet, which increases the Johnson noise generated at the contacts. The Johnson noise is amplified and the absorption of a photon is detected by the power detector and pulse detector.
Abstract translation: 用于检测单个光子的红外辐射的检测器。 在一个实施例中，配置成透射红外辐射的波导被布置成与石墨烯片相邻并且被配置为使得来自波导的消逝波与石墨烯片重叠。 石墨烯片具有连接到放大器，功率检测器和脉冲检测器的两个触点。 由ev逝波吸收的石墨烯片的红外光子加热石墨烯片，这增加了在触点处产生的约翰逊噪声。 约翰逊噪声被放大，光子的吸收由功率检测器和脉冲检测器检测。
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8.发明申请JOSEPHSON JUNCTION READOUT FOR GRAPHENE-BASED SINGLE PHOTON DETECTOR 有权用于基于石墨的单光子探测器的JOSEPHSON JUNCTION READOUT公开(公告)号：US20160372622A1
公开(公告)日：2016-12-22
申请号：US15242381
申请日：2016-08-19
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong , Thomas A. Ohki
IPC: H01L31/109 , H01L39/22 , H01L31/0304 , G01J1/44
CPC classification number: H01L31/109 , G01J1/42 , G01J1/4257 , G01J1/44 , G01J5/20 , G01J2001/442 , G01J2001/4446 , H01L29/1606 , H01L31/03044 , H01L39/223
Abstract: A detector for detecting single photons of infrared radiation. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. In some embodiments the waveguide is omitted and infrared light propagating in free space illuminates the graphene sheet directly. A photon absorbed by the graphene sheet from the evanescent waves heats the graphene sheet. The graphene sheet is coupled to the weak link of a Josephson junction, and a constant bias current is driven through the Josephson junction, so that an increase in the temperature of the graphene sheet results in a decrease in the critical current of the Josephson junction and a voltage pulse in the voltage across the Josephson junction. The voltage pulse is detected by the pulse detector.
Abstract translation: 用于检测单个光子的红外辐射的检测器。 在一个实施例中，配置成透射红外辐射的波导被布置成与石墨烯片相邻并且被配置为使得来自波导的消逝波与石墨烯片重叠。 在一些实施例中，波导被省略，并且在自由空间中传播的红外光直接照射石墨烯片。 石墨烯片从ev逝波吸收的光子加热石墨烯片。 石墨烯片被耦合到约瑟夫逊结的弱连接处，并且通过约瑟夫逊结驱动恒定的偏置电流，使得石墨烯片的温度升高导致约瑟夫逊结的临界电流的降低，并且 在约瑟夫逊结的电压中的电压脉冲。 电压脉冲由脉冲检测器检测。
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公开(公告)号：US09502630B1
公开(公告)日：2016-11-22
申请号：US14846013
申请日：2015-09-04
Applicant: RAYTHEON BBN TECHNOLOGIES CORP.
Inventor： Kin Chung Fong , Thomas A. Ohki
Abstract: A detector for detecting single photons of infrared radiation. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. An infrared photon absorbed by the graphene sheet from the evanescent waves heats the graphene sheet. The graphene sheet is coupled to the weak link of a Josephson junction, and a constant bias current is driven through the Josephson junction, so that an increase in the temperature of the graphene sheet results in a decrease in the critical current of the Josephson junction and a voltage pulse in the voltage across the Josephson junction. The voltage pulse is detected by the pulse detector.
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公开(公告)号：US11592337B2
公开(公告)日：2023-02-28
申请号：US17400047
申请日：2021-08-11
Inventor： Kin Chung Fong , Dirk Robert Englund
Abstract: An evaporatively cooled device and a system including the same. In some embodiments, the system includes an oligolayer conductive sheet; a superconductor; a tunneling barrier, between the oligolayer conductive sheet and the superconductor; and a bias circuit, configured to apply a bias voltage across the tunneling barrier, the bias voltage being less than a gap voltage of the superconductor and greater than one-half of the gap voltage of the superconductor.
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