Terahertz liquid crystal phase shifter based on metamaterial composite structure

Abstract

The invention discloses a terahertz liquid crystal phase shifter based on a metamaterial composite structure, which consists of four layers of structures, namely an upper L-shaped metal resonance layer, a liquid crystal layer, a lower bow-shaped metal resonance layer and a quartz substrate layer in sequence from top to bottom, according to the terahertz liquid crystal phase shifter, bias voltage is applied to the upper metal layer and the lower metal layer, the deflection angle of liquid crystal molecule directors in a liquid crystal box is changed, and therefore the purpose of dynamically regulating and controlling the phase of the terahertz liquid crystal phase shifter is achieved; and secondly, the terahertz phase shifter disclosed by the invention is proved to have extremely low insertion loss in actual experiments, and has the characteristics of simple structure, small size, large phase shifting amount, convenience in dynamic regulation and control and the like.

Description

Technical field [0001] The present invention relates to the technical fields of electromagnetic waves and new electromagnetic materials, and in particular to a terahertz phase shifter with a metamaterial multilayer structure. Background technique [0002] Metamaterial is an artificial composite material composed of periodically arranged unit structures. Certain extraordinary electromagnetic properties can be achieved by adjusting the resonant unit structure, such as negative refractive index, negative magnetic permeability, electromagnetic induced transparency (EIT), Perfect absorption of other electromagnetic phenomena. Its electromagnetic properties depend on the design of different structures, and unit structures of different sizes have different electromagnetic properties. [0003] In recent years, terahertz technology has been increasingly widely used in communications, imaging, sensing, security inspection, life medicine, non-destructive testing and other fields. Vari...

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Problems solved by technology

[0004] At present, there are few studies on terahertz phase shifters, and the metamaterial unit structures of terahertz phase shifters that have appeared in the field of view are relatively complex and are all in the millimeter wave band, with small phase shifts, high insertion loss, and relatively low material requirements. Insufficiencies such as high driving voltage applied externally to multi-terahertz liquid crystal phase shifters

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