Terahertz detection device

Abstract

A terahertz detection device for detecting terahertz wave signal generated by femtosecond laser radiation, comprising a PCB board, a photoconductive module (100) disposed on the PCB board, a response regulation module (200) and an amplification module (300). In the terahertz detection device, the photoconductive module (100), the response regulation module (200) and the amplification module (300) are arranged in a same device so that the photoconductive module (100) and the amplification module (300) are close to each other, thereby increasing the matching resistance, capacitance and charge release resistance. At the same time, the response regulation module (200) is adjusted to minimize a response time of the terahertz detection device, thereby eliminating and suppressing the transmission and coupling of noise, and maximizing the signal-to-noise ratio and the sampling rate. Meanwhile, the volume of the terahertz detection device is reduced, while also saving on costs.

Description

technical field [0001] The invention relates to the technical field of terahertz detection, in particular to a terahertz detection device. Background technique [0002] Terahertz waves (THz waves) refer to electromagnetic waves with a frequency between 0.1 and 10 THz. Terahertz waves have short wavelengths, no ionizing radiation, and contain rich spectral information, which can be used to identify material types and components. Terahertz technology has great application prospects in medical, food, safety monitoring, military and other fields. [0003] With the continuous advancement of ultrafast laser technology, terahertz waves are generated and detected by using femtosecond lasers to excite semiconductor surfaces and using photoconductive emission and reception mechanisms. Among them, the terahertz photoconductive detector couples the terahertz electromagnetic wave through the photoconductive antenna on the semiconductor material to form the high-speed movement of the car...

AI Technical Summary

Problems solved by technology

However, when the terahertz signal is weak or the light intensity of the photoconductor is very low, the noise current and coupling noise current formed by the input current noise, shot noise, Johnson noise, etc. of the amplifier module will be higher than those generated by the terahertz wave. The actual current

At the same time, a mismatch between the impedance of the amplifier and the impedance of the photoconductive antenna will also reduce the performance-to-noise ratio of the device.

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