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A Superconducting Nanowire Single Photon Detector System Without RF Amplifier

A single photon detector, superconducting nanowire technology, applied in the direction of the instrument, to achieve the effect of removing capacitive coupling effect, high count rate, and reducing the electrical time constant

Active Publication Date: 2019-12-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Device response speed restricted by dynamic inductance
[0007] (3) The fastest response speed of SNSPD normal operation is restricted by thermal time constant

Method used

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  • A Superconducting Nanowire Single Photon Detector System Without RF Amplifier
  • A Superconducting Nanowire Single Photon Detector System Without RF Amplifier
  • A Superconducting Nanowire Single Photon Detector System Without RF Amplifier

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Experimental program
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Effect test

Embodiment 1

[0048] A superconducting nanowire single photon detector system without radio frequency amplifier, including: single mode fiber 1, closed cycle refrigerator 2, bias T 3, low-noise stabilized source 4, 100kΩ resistor 5, and oscilloscope 6; , The closed-cycle refrigerator 2 is provided with a SNSPD 21, and the SNSPD 21 is electrically connected to the bias T 3 through a coaxial cable 22, and an optical fiber focuser 23 working in cooperation with the SNSPD 21 is also provided.

[0049] Among them, the superconducting nanowire single-photon detector SNSPD21 and the current library (technical term known to those skilled in the art, and this is not repeated in the embodiment of the present invention) are structurally integrated, and it is implemented without using a radio frequency amplifier. Self-amplification of the output pulse.

[0050] Such as figure 1 Shown is the SNSPD system without RF amplifier. The light emitted by the light source 7 is introduced into the closed-cycle refrig...

Embodiment 2

[0058] An application of a superconducting nanowire single-photon detector system without RF amplifier in photon counting, see Figure 3-Figure 8 , The photon counting application includes:

[0059] The SNSPD with the above structure amplifies the output pulse signal and improves the signal-to-noise ratio. It can display the output waveform on the oscilloscope without the RF amplifier, such as image 3 Shown is the output pulse waveform of the SNSPD integrated with a 100nm wide nanowire and a 300nm wide current bank without the RF amplifier. The peak-to-peak value of the pulse is about 2mV.

[0060] The oscilloscope 6 is used to store the pulse signals of a certain time interval as one frame, and the number of pulses can be obtained by collecting multiple frames of signals and doing statistical average, that is, the photon count. Such as Figure 4 As shown, it is a waveform acquired with a 50μs time interval as a frame.

[0061] The specific photon counting includes the following st...

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Abstract

The invention discloses a superconducting nanowire single-photon detector system without a radio-frequency amplifier. The system is composed of a single-mode fiber for guiding light emitted by a lightsource into a closed-cycle refrigerator. An SNSPD is arranged inside the closed-cycle refrigerator and a bias unit T is connected by a coaxial cable. Besides, a fiber focusing device working by cooperating with the SNSPD is also arranged and is connected to the tail end of a single-mode fiber. A bias current is provided by a direct-current source formed by a low-noise voltage-stabilizing source and a low-noise resistor connected in series with the voltage-stabilizing source; the current enters the SNSPD through the radio frequency and direct-current ends of the bias unit T; and when a response pulse is generated by triggering by the photon, the local state becomes an impedance state and a pulse signal flows out through the radio frequency end of the bias unit T. An oscilloscope collects apulse waveform to carry out photon counting, so that the maximum photon counting limited by the alternating-current coupling effect of the traditional SNSPD read-out circuit is avoided. According tothe invention, the pulse waveform is displayed at the oscilloscope on the premise that the read-out circuit does not use the radio-frequency amplifier, so that the self-amplification of the output pulse is realized.

Description

Technical field [0001] The invention relates to the field of optoelectronic devices, in particular to a superconducting nanowire single-photon detector system, which does not require a radio frequency amplifier. Background technique [0002] Superconducting nanowire single photon detector (SNSPD) is a new single photon detector at the beginning of the 21st century. Compared with the previous photomultiplier tube (PMT) and avalanche diode detector (APD), it uses superconducting materials. The superconducting transition characteristic converts light signals into electrical signals, and realizes photon counting by counting electrical signals. This kind of detector has the advantages of high detection rate, high device efficiency, high count rate, low dark count rate, and low time domain jitter. It has been widely used in many fields, such as: photon counting communication, biomedical imaging, and time Resolve the spectral domain. [0003] In the traditional SNSPD system, the SNSPD d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 胡小龙迟晓铭邹锴
Owner TIANJIN UNIV
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