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Copper-oxygen-based high-temperature superconducting single-photon detector and preparation method thereof

A single-photon detector and high-temperature superconducting technology, applied in the field of light detection, can solve problems such as low light absorption efficiency, affect the application of copper-oxygen high-temperature superconducting materials, and difficult precise processing, so as to increase light absorption and improve light absorption The effect of low efficiency, usage and storage costs

Active Publication Date: 2020-03-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-temperature superconducting materials, especially copper-oxygen high-temperature superconducting materials, are ceramics, and it is very difficult to precisely process them at the nanoscale. This factor affects the application of copper-oxygen high-temperature superconducting materials in micro-nano electronic devices.
At the same time, superconducting nanowire single-photon detection devices have the disadvantages of low light absorption efficiency and polarization-selective light absorption.

Method used

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  • Copper-oxygen-based high-temperature superconducting single-photon detector and preparation method thereof
  • Copper-oxygen-based high-temperature superconducting single-photon detector and preparation method thereof
  • Copper-oxygen-based high-temperature superconducting single-photon detector and preparation method thereof

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Effect test

Embodiment 1

[0046] A copper-oxide high-temperature superconducting single-photon detector, such as figure 1 As shown, it includes a substrate 20, a copper oxide high temperature superconducting microwire 211 and a dielectric thin film mirror 23 arranged in sequence from bottom to top. A nanohole array is arranged in the copper oxide high temperature superconducting microwire 211, and the copper oxide high temperature superconducting microwire 211 is provided with a nanohole array. Metal nanoparticles 22 are disposed on the high temperature superconducting microwire 211 .

[0047] In the present invention, the copper-oxygen high-temperature superconducting micro-wire 211 can enable the superconducting single-photon detector to work at a temperature of 77K, which facilitates the use of the superconducting single-photon detector. Arranging nanohole arrays on the copper-oxygen high-temperature superconducting microwires 211 can make the microwires into a submicron wire (one hundred or tens of...

Embodiment 2

[0066] A copper-oxygen high-temperature superconducting single-photon detector and a preparation method thereof provided according to Embodiment 1, the difference is that:

[0067] The substrate 20 is a strontium titanate substrate with a thickness of 500 μm. The material of the high temperature superconducting microwire is Bi 2 Sr 2 Ca 2 Cu 3 o 10 (BSCCO).

[0068] The shape of the copper-oxygen high-temperature superconducting micro-wire 211 is a spiral curve, the width of the high-temperature superconducting micro-wire is 5 μm, and the thickness is 40 nm; Figure 8 As shown, the shape of the nanoholes 212 is an ellipse, the long axis is 130 nm, and the short axis is 70 nm. The array formed by the nanoholes 212 is arranged periodically in a two-dimensional hexagonal structure with a period length of 230 nm.

[0069] Metal nanoparticles 22 are silver nanospheres with a diameter of 50 nm.

[0070] The dielectric film mirror 23 includes alternately stacked low refractive...

Embodiment 3

[0072] A copper-oxygen high-temperature superconducting single-photon detector and a preparation method thereof provided according to Embodiment 1, the difference is that:

[0073] The substrate 20 is a lanthanum aluminate substrate, and the material of the copper-oxygen high-temperature superconducting micro-wire 211 is HgBa 2 Ca 2 Cu 3 o 8 (HBCCO).

[0074] The shape of the metal nanoparticles 22 is a gold nanorod, the length of the gold nanorod is 50 nm, and the diameter of the end surface of the gold nanorod is 50 nm.

[0075] The dielectric film mirror 23 includes alternately stacked low refractive index dielectric layers 231SiO 2 layer and the high-refractive-index dielectric layer 232Si layer, and the layer in contact with the copper-oxygen high-temperature superconducting microwire 21 containing the nanohole array is the low-refractive-index dielectric layer 231SiO 2 layer. The thickness of each medium layer is 1 / 4 of the incident wavelength in this medium, and t...

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Abstract

The invention relates to a copper-oxygen-based high-temperature superconducting single-photon detector and a preparation method thereof. The single-photon detector comprises a substrate, a copper-oxygen-based high-temperature superconducting micron wire and a dielectric film reflector which are sequentially arranged from bottom to top, a nanopore array is arranged in the copper-oxygen-based high-temperature superconducting micron wire, and metal nanoparticles are arranged on the copper-oxygen-based high-temperature superconducting micron wire. The single-photon detector works at the liquid nitrogen temperature of 77K, the use and storage cost of liquid nitrogen is greatly lower than that of liquid helium equipment, and the use of the single-photon detector is facilitated. The detector adopts a working mode of back incidence, Meanwhile, the local enhancement effect of the metal nanoparticles is utilized, so that the light absorption rate of the device is improved, and the detection efficiency of incident light in each polarization direction is enhanced on the whole. The preparation method of the copper-oxygen-based high-temperature superconducting single-photon detector is low in working cost and simple in preparation process.

Description

technical field [0001] The invention relates to a copper-oxygen high-temperature superconducting single-photon detector and a preparation method thereof, belonging to the technical field of optical detection. Background technique [0002] Superconducting Nanowire Single Photon Detector (SNSPD) is an important photon signal detector. Compared with traditional semiconductor detectors, SNSDP has fast response speed, low background noise, small time jitter, and covers from Visible light to infrared band. [0003] In a low temperature environment, SNSPD is in a superconducting state, and a bias current I is applied to it b (I b Slightly less than the switching current I of the device switching to the normal state switch ) to make it work. When a single photon or multiple photons are incident on a superconducting nanowire, it will break the Cooper electron pairs that form the superconducting state, forming a large number of hot electrons, and the diffusion of hot electrons for...

Claims

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Application Information

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IPC IPC(8): H01L31/0232H01L31/0352H01L31/18
CPCH01L31/02327H01L31/0352H01L31/18Y02P70/50
Inventor 王强徐明升侯雷
Owner SHANDONG UNIV
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