Electronic control liquid crystal adjustable terahertz wave absorber based on synchronous drive of graphene/metamaterial and preparing method of electronic control liquid crystal adjustable terahertz wave absorber

Abstract

The invention discloses an electronic control liquid crystal adjustable terahertz wave absorber based on synchronous drive of graphene / metamaterial and a preparing method of the electronic control liquid crystal adjustable terahertz wave absorber, and belongs to the technical field of terahertz optoelectronics. The absorber comprises a quartz substrate a, a liquid crystal layer and a quartz substrate b, the quartz substrate a and the quartz substrate b are combined through a glue frame to constitute a liquid crystal box, and the liquid crystal layer is arranged at the junction of the quartz substrate a and the quartz substrate b; the inner side of the quartz substrate a comprises a periodic sub-wavelength metal unit array, a porous graphene layer and a light orientation layer a from insideto outside in sequence; the inner side of the quartz substrate b comprises a metal reflection mirror and a light orientation layer b from inside to outside in sequence, and a terahertz wavelength large-double-refraction-rate liquid crystal material is injected into the liquid crystal layer. The preparing method is simple and efficient, a sub-wavelength modular construction array can be designed randomly, the prepared electronic control liquid crystal adjustable terahertz wave absorber has a high electric field distribution and liquid crystal control capability, and meanwhile, the absorber hasthe advantages that the modulating frequency band is wide, and the modulating speed is high.

Description

technical field [0001] The invention relates to the technical field of terahertz optoelectronics, in particular to an electrically controlled liquid crystal tunable terahertz wave absorber based on graphene / metamaterial synergistic driving and a preparation method thereof. Background technique [0002] Liquid crystal materials have both the fluidity of liquids and the orderliness of crystals. Due to their excellent tuning characteristics of external fields (electric field, magnetic field, light field, sound field, temperature field, etc.), they play an important role in information display and tunable photonic devices. Applications. Nematic liquid crystals are the most commonly used phase, and orientation is the primary factor in all nematic liquid crystal applications. The traditional orientation method is the most widely used rubbing orientation, which has defects such as easy mechanical damage to the surface, residual electrostatic charge and particle contamination, and ...

AI Technical Summary

Problems solved by technology

However, when applied to the terahertz frequency band, on the one hand, the commonly used transparent conductive film indium tin oxide will no longer be applicable, and a simple metal layer cannot meet the requirements, so it is necessary to seek a new electrode design

On the other hand, the birefringence of most liquid crystal materials will be relatively small in the terahertz frequency band, so the adjustable amount is also small, and it is difficult to meet practical requirements in general design

And some special means to increase the amount of modulation, such as stacked structures, etc., will seriously increase the loss under the condition of lack of transparent electrodes.

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