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Superconducting nanowire single-photon detector system without radio-frequency amplifier

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

Active Publication Date: 2018-10-19
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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  • Superconducting nanowire single-photon detector system without radio-frequency amplifier
  • Superconducting nanowire single-photon detector system without radio-frequency amplifier
  • Superconducting nanowire single-photon detector system without radio-frequency amplifier

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Embodiment 1

[0048] A superconducting nanowire single-photon detector system without a radio frequency amplifier, comprising: a single-mode fiber 1, a closed-cycle refrigerator 2, a bias T 3, a low-noise voltage regulator 4, a 100kΩ resistor 5, and an oscilloscope 6; wherein The closed-cycle refrigerator 2 is provided with an SNSPD 21, the SNSPD 21 is electrically connected to the bias T3 through a coaxial cable 22, and a fiber focuser 23 that cooperates with the SNSPD 21 is also provided.

[0049] Wherein, the superconducting nanowire single-photon detector SNSPD21 is structurally integrated with a current bank (a technical term known to those skilled in the art, which will not be repeated in this embodiment of the present invention), and is realized without using a radio frequency amplifier. Self-amplification of the output pulse.

[0050] like figure 1 Shown is the SNSPD system without RF amplifier. The light emitted from the light source 7 is guided into the closed-cycle refrigerator...

Embodiment 2

[0058] Application of a superconducting nanowire single-photon detector system without an RF amplifier to photon counting, see Figure 3-Figure 8 , the photon counting applications include:

[0059] The SNSPD with the above structure amplifies the output pulse signal and improves the signal-to-noise ratio, and can display the output waveform on the oscilloscope without adding a radio frequency 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 library without an RF amplifier, and the peak-to-peak value of the pulse is about 2mV.

[0060] Use the oscilloscope 6 to store pulse signals at a certain time interval as one frame, and collect multiple frames of signals for statistical average to obtain the number of pulses, that is, photon counting. like Figure 4 As shown, it is a waveform collected with a time interval of 50 μs as a frame.

[0061] The specific photon counting includes the fol...

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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 an emerging single photon detector in the early 21st century. Compared with previous photomultiplier tubes (PMTs) and avalanche diode detectors (APDs), it utilizes the The superconducting transition characteristic converts optical signals into electrical signals, and photon counting is achieved 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 small time domain jitter, and has been widely used in many fields, such as: photon counting communication, biomedical imaging, and time domain Resolving spectral fields. [0003] In the traditional SNSPD system, the structure o...

Claims

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Application Information

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IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 胡小龙迟晓铭邹锴
Owner TIANJIN UNIV
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