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.

Inventor： Mohsen KESHAVARZ AKHLAGHI

IPC: G01J1/44 ,  G01J1/02 ,  G01J1/04 ,  G01R19/00

CPC classification number: G01J1/44 ,  G01J1/0252 ,  G01J1/0425 ,  G01R19/0092 ,  G01J2001/442

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.

公开(公告)号：US12123777B2

公开(公告)日：2024-10-22

申请号：US17730374

申请日：2022-04-27

Applicant: Purdue Research Foundation

Inventor： Joseph Sinfield ,  Yu-Chung Lin

IPC: G01J3/44 ,  G01N21/65 ,  G01J1/44

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.

公开(公告)号：US12085789B2

公开(公告)日：2024-09-10

申请号：US17202613

申请日：2021-03-16

Applicant: HI LLC

Inventor： Ryan Field ,  Jacob Dahle ,  Rong Jin ,  Alex Borisevich ,  Sebastian Sorgenfrei ,  Bruno Do Valle

IPC: G02F1/01 ,  A61B5/00 ,  G01J1/42 ,  G01J1/44 ,  H04B10/50

CPC classification number: G02F1/0123 ,  A61B5/0075 ,  G01J1/4228 ,  G01J1/44 ,  H04B10/50575 ,  A61B5/0042 ,  A61B2562/0238 ,  G01J2001/442 ,  G01J2001/4466 ,  G01J2001/448

Abstract: An exemplary optical measurement system described herein includes a control circuit configured to output a global bias voltage and a module communicatively coupled to the control circuit. The module includes a light source configured to emit light directed at a target. The module further includes a plurality of detectors configured to detect arrival times for photons of the light after the light is scattered by the target. The module further includes a module control circuit configured to receive the global bias voltage and output a plurality of detector bias voltages based on the global bias voltage. The plurality of detector bias voltages include a respective detector bias voltage for each detector of the plurality of detectors.

公开(公告)号：US12044568B2

公开(公告)日：2024-07-23

申请号：US17851398

申请日：2022-06-28

Applicant: CANON KABUSHIKI KAISHA

Inventor： Yasuharu Ota ,  Yukihiro Kuroda

IPC: G01J1/44 ,  G05D1/00 ,  H04N25/709 ,  H04N25/75 ,  H04N25/76

CPC classification number: G01J1/44 ,  G05D1/0246 ,  H04N25/709 ,  H04N25/75 ,  H04N25/76 ,  G01J2001/442 ,  G01J2001/4466

Abstract: A photoelectric conversion device includes an avalanche multiplying photodiode, a signal generation unit that includes a control unit configured to control an applied voltage to the photodiode and generates a photon detection pulse based on an output generated by incidence of a photon to the photodiode, and a counter that counts the photon detection pulse output from the signal generation unit, and the counter outputs a setting value detection signal when a count value of the photon detection pulse reaches a predetermined setting value, and in response to receiving the setting value detection signal, the control unit controls the applied voltage to the photodiode so as to stop generation of an avalanche current in the photodiode.

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

Inventor： Min Soo Lee ,  Jeonghwan Shin ,  Kyung-Woon Lee

IPC: G01J1/44 ,  H04B10/70

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).

公开(公告)号：US11994426B1

公开(公告)日：2024-05-28

申请号：US17098235

申请日：2020-11-13

Applicant: PsiQuantum Corp.

Inventor： Faraz Najafi ,  Eric Dudley

IPC: G01J1/44 ,  G01J1/42 ,  G06N10/00 ,  H10N60/30 ,  H10N60/84 ,  H10N69/00

CPC classification number: G01J1/44 ,  G01J1/4228 ,  G06N10/00 ,  H10N60/30 ,  H10N60/84 ,  H10N69/00 ,  G01J2001/442 ,  G01J2001/4473

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.

公开(公告)号：US11982565B2

公开(公告)日：2024-05-14

申请号：US17170563

申请日：2021-02-08

Applicant: Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Inventor： François Ayel

IPC: G01J1/44

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.

公开(公告)号：US20240011829A1

公开(公告)日：2024-01-11

申请号：US17965692

申请日：2022-10-13

Applicant: ORCA Computing Limited

Inventor： Niall Moroney ,  Robert Francis-Jones ,  Paris Andreades

IPC: G01J1/44 ,  G02F1/35 ,  G02F1/39 ,  G01J1/04 ,  G02F1/21

CPC classification number: G01J1/44 ,  G02F1/3503 ,  G02F1/353 ,  G02F1/39 ,  G02F1/3526 ,  G01J1/0488 ,  G01J1/0459 ,  G02F1/212 ,  G01J1/0418 ,  G02F2203/48 ,  G01J2001/442

Abstract: A system is provided for producing an output photon having a predefined frequency. A pump module produces a plurality of pump fields at a plurality of pump frequencies. A photon pair source module generates frequency-correlated photon pairs. A detector module generates a heralding signal subsequent to detecting a first photon of a photon pair, the heralding signal indicative of a frequency of the second photon of the pair. A non-linear photonic element is arranged to (1) receive the heralded second photon and a complementary selected pump field, and (2) to produce an output photon having the predefined frequency. A pump field selector is configured to (1) receive a heralding signal and (2) select, based on the received heralding signal, a pump field of the plurality of pump fields for provision to the non-linear element. Methods, controllers and computer-readable media are also described herein.

公开(公告)号：US11835386B2

公开(公告)日：2023-12-05

申请号：US18145442

申请日：2022-12-22

Applicant: CANON KABUSHIKI KAISHA

Inventor： Shogo Yamasaki

IPC: G01J1/44 ,  H01L31/107

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.

公开(公告)号：US11813041B2

公开(公告)日：2023-11-14

申请号：US16844860

申请日：2020-04-09

Applicant: HI LLC

Inventor： Ryan Field ,  Bruno Do Valle ,  Jacob Dahle ,  Rong Jin ,  Sebastian Sorgenfrei

IPC: A61B5/00 ,  G01J1/44 ,  G04F10/00

CPC classification number: A61B5/0082 ,  A61B5/6803 ,  A61B5/742 ,  G01J1/44 ,  G01J2001/442 ,  G01J2001/4466 ,  G04F10/005

Abstract: An exemplary photodetector system includes a plurality of photodetectors connected in parallel and a processor communicatively coupled to the plurality of photodetectors. The processor is configured to receive an accumulated output from the plurality of photodetectors. The accumulated output represents an accumulation of respective outputs from each of the plurality of photodetectors detecting photons during a predetermined measurement time period that occurs in response to a light pulse being directed toward a target within a body. The processor is further configured to determine, based on the accumulated output, a temporal distribution of photons detected by the plurality of photodetectors, and generate, based on the temporal distribution of photons, a histogram representing a light pulse response of the target within the body.