Single photon detector based on superconducting film material and method of manufacture

A single-photon detector, superconducting thin film technology, applied in nanostructure manufacturing, instruments, nanotechnology and other directions, can solve the problems of low repetition rate of photon meter detector, can not meet quantum communication and other problems, achieve low dark count and high sensitivity , the effect of fast light response

Inactive Publication Date: 2009-01-07
NANJING UNIV
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Problems solved by technology

At the same time, the repetition rate of these photon meter detectors is generally low, only 10MHz in a completely ideal state, which obviously cannot meet the needs of quantum communication and other fields

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  • Single photon detector based on superconducting film material and method of manufacture
  • Single photon detector based on superconducting film material and method of manufacture
  • Single photon detector based on superconducting film material and method of manufacture

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Embodiment Construction

[0023] The present invention uses ultra-thin film technology to successfully grow high-quality ultra-thin NbN film on a single crystal MgO(100) substrate, and designs and prepares a single photon detector based on this NbN film, which can be used for visible light to near-infrared light Detection of single photons and extremely weak light in the wavelength band. The present invention includes two aspects: a single photon detector system and a superconducting detection device. The detector system includes an electrical system, an optical system, a device and a low temperature system. The specific implementation is as follows.

[0024] Electrical system: The electronic system includes DC source, signal transmission, signal amplification and detection, etc. Circuit diagram as figure 2 , the power supply in the figure can be a constant current source or a constant voltage source. The power supply is connected to the DC section of the bias tree through a coaxial cable, and the b...

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Abstract

The invention discloses a single-photon detector based on the superconducting thin film material, which comprises an optical path system, a superconducting device and an electric system. The optical path system is used for coupling, transmitting and regulating incident optical signals; the superconducting device is used for detecting incident photon signals in the environment of low temperature; the electric system is used for reading, processing and analyzing electric signals. The invention also discloses a manufacturing method of the superconducting device of the single-photon detector. The method comprises the following steps: the growth of the superconducting thin film; the graphic design and micro processing of the superconducting device. The single-photon detector has the advantages of high sensitivity, low dark counting, high repeating speed, and so on, and has important prospects of application in a plurality of fields.

Description

technical field [0001] The present invention proposes a single photon detector based on a superconducting ultra-thin film material, which involves single photon detection and extremely weak light detection, and is suitable for single photon detection and extremely weak light detection. The detected light wavelength includes 400nm-2000nm. Background technique [0002] As we all know, light has two characteristics of wave and particle. When the light is weak to a certain extent, its particle nature is very obvious. Based on this phenomenon and the theory of the photoelectric effect, people study the use of photon counters that record the number of photons to detect weak light, such as photomultiplier tubes and avalanche diodes. Due to the technical requirements of photon counting put forward higher requirements - single photon detection, and these current products are facing great challenges. Taking avalanche diodes as an example, avalanche diodes are divided into visible l...

Claims

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Application Information

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IPC IPC(8): G01J11/00B82B3/00
Inventor 康琳张蜡宝陈健吴培亨
Owner NANJING UNIV
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