Implementation method of superconducting nanowire single-pixel spectrometer with programmable responsivity

A technology of superconducting nanowires and implementation methods, which is applied in the field of miniature single-pixel spectrometers, and can solve problems such as bulky, no spectral resolution ability, and inability to meet compact applications.

Active Publication Date: 2020-09-11
NANJING UNIV
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Problems solved by technology

Although the superconducting nanowire single-photon detector has a wide spectral response range, it has no spectral resolution capability. To make a spectrometer, the current practice is to place additional optical elements in front of the detector, which leads to its volume. Bulky, not enough for some compact applications

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  • Implementation method of superconducting nanowire single-pixel spectrometer with programmable responsivity
  • Implementation method of superconducting nanowire single-pixel spectrometer with programmable responsivity
  • Implementation method of superconducting nanowire single-pixel spectrometer with programmable responsivity

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The superconducting nanowire single photon detector is a photon counting detector, and the measured light intensity can be characterized by the counting rate of the detector. It consists of superconducting thin-film nanowires biased with an electric current, such as figure 2 Shown in part a. When a photon is absorbed by the nanowire, an electrical pulse is generated probabilistically. This probability and the magnitude of the bias current are related to the energy of the photon. As the bias current is increased, the cutoff wavelength of the detector response shifts to longer wavelengths, such as figure 1 Shown in part b. That is to say, when biased at different currents, the spectral responsivity of the detector is linearly independent, that is, the present invention has discovered that the superconducting nanowire single photon detector has diffe...

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Abstract

The invention discloses an implementation method of a superconducting nanowire single-pixel spectrometer with programmable responsivity. An intrinsic wavelength-current response matrix of a superconducting nanowire single-photon detector is measured, light counting rates under different currents are measured, and calculating and reconstructing are performed. The method comprises the following steps: step 1, calibrating an intrinsic wavelength-current response matrix phi (i, lambda) of the superconducting nanowire single-photon detector; step 2, under the irradiation of incident light, measuring light counting rates y (i) under different currents; and step 3, calculating a reconstructed incident spectrum x (lambda). With the implementation method of the superconducting nanowire single-pixelspectrograph with the programmable responsivity, spectral measurement under extremely weak light can be realized by only one detection unit without an additional optical modulation unit and a detector array.

Description

technical field [0001] The invention relates to an integrated miniature single-pixel spectrometer, in particular to a superconducting nanowire single-pixel spectrometer with programmable responsivity, which is suitable for space-compact spectrum detection under extremely weak light. Background technique [0002] Spectral detection under extremely weak light requires detectors with single-photon sensitivity. Superconducting nanowire single-photon detectors have many excellent properties: wide spectral response range, low dark count, high dynamic range, and easy on-chip photon integration. Although the superconducting nanowire single-photon detector has a wide spectral response range, it has no spectral resolution capability. To make a spectrometer, the current practice is to place additional optical elements in front of the detector, which leads to its volume. Bulky, unable to satisfy some compact applications. Contents of the invention [0003] Aiming at the above-mentio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/12G01J3/28G01J1/44
CPCG01J1/44G01J3/12G01J3/28G01J2001/442
Inventor 赵清源孔令东
Owner NANJING UNIV
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