Study On Detecting Continuous Teraherz Wave Using Electro-plasma

The teraherz (THz) wave has great application potential in the fields of object imaging and detection, environmental monitoring, medicine and health, mobile communication, aerospace and so on because of its unique characteristics. In recent years, many countries in the world have carried out fruitful research in the field of THz science and technology, and achieved fruitful results. However, the lack of high sensitivity, fast response, relatively inexpensive and room temperature THz wave detector is one of the main bottlenecks restricting the development of THz technology. In view of this international problem, this paper proposes to use the plasma produced by the glow discharge of inert gas to 'detect THz wave, and to develop a glow discharge THz wave detector (GDD). The main results are as follows:(1) In this paper, the detection principle of GDD in THz band is studied. It is found that the incident THz wave enhances the particle motility of GDD internal discharge gas, improves the atomic ionization rate and internal cascade gain, thus enhancing the discharge current and luminous intensity.(2) The THz wave signal is obtained by the method of detecting the change of the discharge current of the GDD under the THz wave. The amplitude of the THz wave signal is 6.3 mV, and the influence of the bias voltage of the neon lamp on the detection effect is studied. The detection efficiency is proportional to the voltage of the neon lamp, and the maximum signal -to - noise ratio is 126: 1.(3) The method of detecting light intensity change of GDD under the action of THz wave is put forward for the first time. The THz wave is detected by optical detection method, and the amplitude of THz wave is 3.3 mV. The influence of modulation frequency on signal to noise ratio (SNR) and the upper bound of modulation frequency are obtained, and the maximum signal-to-noise ratio (SNR) is 66:1, and the performance of this system is still very high.This paper provides a new idea for understanding the effect of THz wave and plasma and the development of new THz wave detector.