Composite photoconductive antenna and terahertz wave radiation source

Abstract

The invention discloses a composite photoconductive antenna and a terahertz wave radiation source. The composite photoconductive antenna is characterized by comprising a photoconductor, a dipole antenna and a clamp electrode, the dipole antenna is positioned on the upper surface of the photoconductor and provided with a transverse structure, the clamp electrode is positioned on the lower surface of the photoconductor and forms a longitudinal structure with the dipole antenna, and two illumination areas are formed on the photoconductor. The composite photoconductive antenna has the advantages that switches with longitudinal structures are high in puncture voltage and flow capacity, the antenna with the transverse structure is simple to manufacture and the like, and the service life of the photoconductive antenna is prolonged. The terahertz wave radiation source charges the composite photoconductive antenna with a symmetric structure by the aid of a bridge circuit, the two longitudinal switches are synchronously triggered, energy consumption of the circuit is decreased, and terahertz waves are radiated at maximum efficiency.

Description

technical field [0001] The invention belongs to the interdisciplinary field of ultra-high-speed electronics, ultra-fast optics and pulse power, and relates to a composite photoconductive antenna and a terahertz wave radiation source based on the composite photoconductive antenna. Background technique [0002] Terahertz wave (THz) generally refers to electromagnetic waves with a wavelength between infrared and microwave (30μm-3mm). Compared with other bands, terahertz electromagnetic wave has its unique characteristics of transient, broadband, coherence and low energy, making it widely used in object imaging, medical diagnosis, environmental monitoring, radio astronomy, broadband mobile communication, satellite communication and military Radar and other fields have great scientific value and broad application prospects. [0003] THz waves are located at the junction of traditional electronics and optics, which means that electronic methods, optical methods, or a combination ...

AI Technical Summary

Problems solved by technology

However, although these methods can improve the withstand voltage of the switch to a certain extent, they all have certain limitations. Increasing the electrode gap will reduce the terahertz radiation power of the antenna; it is difficult to manufacture photoconductive switch antennas with longitudinal structures and different-surface electrode structures; applying insulation protection increases the difficulty of manufacturing and packaging photoconductive antennas, and there are many problems in practical applications. inconvenient

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