Detector based on signal bias and superconductive niobium nitride bolometer

Abstract

The invention discloses a detector based on signal bias and a superconductive niobium nitride bolometer. The detector comprises a low-temperature Dewar, a chip of the superconductive niobium nitride bolometer, a focusing lens, a bias unit, a DC power supply, a circulator, a bias signal generator and a signal amplifier; the low-temperature Dewar is provided with a transparent window; the chip of the superconductive niobium nitride bolometer is arranged in the low-temperature Dewar; Terahertz waves entering the low-temperature Dewar is focused onto the chip of the superconductive niobium nitride bolometer via the focusing lens; an RF DC port, a DC bias port and an RF output port of the T-shaped bias unit are connected to the chip of the superconductive niobium nitride bolometer, the DC power supply and the circulator respectively; the circulator is a three-port circulator; three ports of the circulator are connected with input ports of the bias signal generator, the bias unit and the signal amplifier respectively; and an output port of the signal amplifier is connected a signal detection interface.

Description

Technical field [0001] The invention relates to terahertz wave signal detection based on a superconducting niobium nitride bolometer. Background technique [0002] At present, a major problem of terahertz imaging is the lack of a detector with high sensitivity and fast response. Commonly used room temperature detectors, such as Colloids detectors, pyroelectric detectors, and Schottky diode detectors, have noise equivalent power generally higher than 10 -11 W / Hz 1 / 2 , And the response time is on the order of ms. Low temperature detectors such as Si Bolometer, although its noise equivalent power can reach 10 -12 W / Hz 1 / 2 However, the response time is 30μs. For terahertz active imaging based on the scanning method, too long a response time will greatly increase the scanning time and cannot approach real-time imaging. [0003] Superconducting niobium nitride bolometer, also known as superconducting NbN HEB, due to the large intermediate frequency gain bandwidth, the response time can ...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is the defect that the superconducting niobium nitride bolometer is applied to the direct detector in the prior art

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