SUPERCONDUCTING SINGLE PHOTON DETECTOR WITH PHOTON NUMBER RESOLUTION

    公开(公告)号:US20240361181A1

    公开(公告)日:2024-10-31

    申请号:US18573369

    申请日:2022-07-22

    Applicant: PHOTONIC INC.

    Abstract: A single photon number resolving detector provides photon number resolution. The detector includes a waveguide which receives photons for detection. Nanowires are located in proximity to the waveguide. Each of the nanowires is connected in series with an electrically resistive component to provide a branch. Plural branches are electrically connected in parallel with one another. A power source is connectable to deliver an electrical current to flow through the branches. A current monitor is connected to monitor a magnitude of the total electrical current in the plurality of branches. At an operating temperature of the detector the nanowires are superconducting and each branch has an electrical time constant which is small enough to cause latching of the branch to a latched state when the nanowire of the branch absorbs a photon from the waveguide. The number of photons detected can be determined from the magnitude of the current which depends on the number of branches in the latched state.

    Methods, algorithms and systems for sub-nanosecond digital signal processing of photomultiplier tube response to enable multi-photon counting in Raman spectroscopy

    公开(公告)号:US12123777B2

    公开(公告)日:2024-10-22

    申请号:US17730374

    申请日:2022-04-27

    CPC classification number: G01J3/4412 G01J3/44 G01N21/65 G01J2001/442

    Abstract: A method of determining the contributions of multiple incident photons to an output of a sensor, including providing a photonic sensor having a sensor input and capable of generating an electrical signal proportional to a number of photons interacting with the photonic sensor input as a function of time, calibrating the photonic sensor such that a response of the photonic sensor to a single photon detected is in a waveform having an amplitude and a time, wherein the product of the amplitude and the time is statistically bounded, determining a probabilistic boundary between one or more of electrical, optical, and thermal sources of noise of the sensor, acquiring a response wave form from the photonic sensor through analog-to-digital conversion with a resolution in amplitude and time corresponding to accuracy required in quantifying the response wave form, storing each acquired response wave form, individually, in a format selected from the group consisting of real-time and buffered packets in digital form, and determining a total count of likely photon arrivals for a specific time resolved acquisition.

    Single photon detector, and operation method

    公开(公告)号:US12038324B2

    公开(公告)日:2024-07-16

    申请号:US18031985

    申请日:2021-10-08

    Applicant: KT CORPORATION

    CPC classification number: G01J1/44 G01J2001/442 H04B10/70

    Abstract: Provided are a single photon detector and an operation method thereof. The single photon detector may include a gate signal generator for generating a gate signal having a first pulse width (ΔP) with respect to a first time point (t1); and a first photon detector for detecting the single photon while operating in a Geiger mode by receiving the gate signal, and outputs a photon detection signal at a second time point (t2), wherein the first photon detector outputs the photon detection signal at the second time point (t2) spaced apart at a predetermine time interval (ΔT) from the first time point (t1).

    Scalable photon number resolving photon detector

    公开(公告)号:US11994426B1

    公开(公告)日:2024-05-28

    申请号:US17098235

    申请日:2020-11-13

    Abstract: A photon counting device includes unit cells, a bias current source coupled to the unit cells, and a waveguide coupled to the unit cells. Each unit cell includes photodetector(s). Each photodetector includes superconducting component(s) and a transistor. The transistor includes a superconducting gate that is coupled in parallel with the photodetector(s), and a channel that is electrically isolated from the superconducting gate. For each unit cell, a photodetector is optically coupled to the waveguide. A superconducting component is configured to transition from the superconducting state to the non-superconducting state in response to a photon being incident upon the superconducting component while the superconducting component receives at least a portion of bias current output from the bias current source. The superconducting gate of the unit cell is configured to transition from the superconducting state to the non-superconducting state in response to the superconducting component transitioning to the non-superconducting state.

    SPAD photodiode control circuit
    7.
    发明授权

    公开(公告)号:US11982565B2

    公开(公告)日:2024-05-14

    申请号:US17170563

    申请日:2021-02-08

    Inventor: François Ayel

    CPC classification number: G01J1/44 G01J2001/442 G01J2001/4466

    Abstract: The present disclosure concerns a SPAD photodiode control circuit, including: a first current source; a current mirror including an input transistor in series with the first current source and an output transistor in series with the SPAD photodiode and a second current source in series with the input transistor of the current mirror and in parallel with the first current source, the second current source being alternately controllable to a so-called inactive state where it delivers no current and to a so-called active state where it delivers a non-zero current which adds, in the input transistor of the current mirror, to a current delivered by the first current source.

    Photoelectric conversion device, imaging system, light detection system, and mobile body

    公开(公告)号:US11835386B2

    公开(公告)日:2023-12-05

    申请号:US18145442

    申请日:2022-12-22

    Inventor: Shogo Yamasaki

    CPC classification number: G01J1/44 H01L31/107 G01J2001/442 G01J2001/4466

    Abstract: A photoelectric conversion device according to an embodiment of the present disclosure includes an avalanche photodiode, a pulse generation unit that converts an output from the avalanche photodiode into a pulse signal, a pulse count unit that counts the pulse signal and outputs a pulse count value, a time count unit that outputs a time count value indicating a time from the start of operation of the pulse generation unit, an output unit that, when the pulse count value does not exceed a threshold value, outputs the pulse count value, and when the pulse count value exceeds the threshold value, ends counting in the pulse count unit and outputs the time count value at the time of the pulse count value exceeding the threshold value, and a threshold calculation unit that calculates the threshold value using the time count value.

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