Interdigital transmission-type terahertz quarter-wave plate

Abstract

The invention protects a transmission-type terahertz quarter-wave plate based on an "interdigital" structure. The basic composition unit of the terahertz quarter-wave plate is a rectangular periodic unit, wherein the rectangular periodic unit is composed of a first metal pattern layer, a middle dielectric layer and a second metal pattern layer, the two metal pattern layers are identical in pattern, and each metal pattern layer is composed of a rectangular metal ring and four rectangular metal bars placed at the inner side of the rectangular metal ring in a crossing mode. The terahertz quarter-wave plate has quite high practicability; and compared with a terahertz quarter-wave plate with the same properties, the structure is simpler, and processing feasibility is improved. The terahertz quarter-wave plate is large in work bandwidth and higher in conversion efficiency, thereby having extremely large development potential in the fields of terahertz wireless communication, terahertz detection, terahertz imaging, etc. in the future.

Description

technical field [0001] The invention belongs to the terahertz quarter-wave plate technology, in particular, it is a transmissive terahertz quarter-wave plate with an “interdigitated” structure. Background technique [0002] "Tahertz" (THz) refers to electromagnetic waves with a frequency in the range of 0.1 to 10 THz, which is between the relatively mature microwave frequency band and the infrared wave frequency band. Compared with microwave communication, terahertz communication has the advantages of high data transmission rate, large capacity, narrow beam, good directionality, good confidentiality, strong anti-interference ability, and plasma penetration ability, and the terahertz antenna is smaller , the attenuation is very small outside the atmosphere, suitable for satellite communication, satellite-ground communication, spacecraft internal communication, etc. Therefore, terahertz communication is regarded as the basis of the sixth or seventh generation communication te...

AI Technical Summary

Problems solved by technology

In traditional optics, the birefringence properties of uniaxial crystals are usually used to convert linearly polarized waves to circularly polarized waves, but the operating bandwidth of the quarter wave plate made of uniaxial crystals is very narrow, which cannot meet Actual demand

There are three main types of existing terahertz quarter-wave plates: open-loop resonant type, cross type and zigzag line type, all of which have many disadvantages such as complex structure, low conversion efficiency, and high cost. Therefore, it is necessary to design a simple structure terahertz quarter-wave plate with large working bandwidth and high conversion efficiency to meet the needs of future terahertz communication, imaging, monitoring and other fields

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