Terahertz metasurface for efficiently driving liquid crystal molecules

Abstract

The invention discloses a terahertz metasurface for efficiently driving liquid crystal molecules. The terahertz metasurface sequentially comprises a top quartz substrate layer, a top metal layer, a liquid crystal layer, a bottom metal layer and a bottom quartz substrate layer from top to bottom. The top metal layer is coated on the lower surface of the top quartz substrate layer, and the bottom metal layer is coated on the upper surface of the bottom quartz layer. The top metal layer comprises metasurface units arranged in an array, and each metasurface unit comprises a resonant ring group. Liquid crystal molecules of a part of a non-metal coverage area are driven by utilizing a fringing field superposition principle between adjacent metal structures, so that more liquid crystal molecules are effectively driven, and the performance upper limit of the liquid crystal metasurface is greatly improved; Through reasonable coding of the metasurface units, the metasurface achieves the maximum 66-degree beam deflection.

Description

technical field [0001] The invention relates to a terahertz metasurface, in particular to a terahertz metasurface for efficiently driving liquid crystal molecules. Background technique [0002] Metasurface technology can effectively control information such as amplitude, phase, polarization, and orbital angular momentum of electromagnetic waves, and has attracted more and more attention from researchers. Its low profile, small size, and low cost make it replace the traditional three-dimensional device, and become a research hotspot of beam control at present. Phase manipulation of terahertz beams can be greatly facilitated by distributing binary-encoded units on the metasurface and dynamically switching the encoding state of each unit. [0003] The terahertz metasurface realized by using liquid crystal materials can realize the encoding of the metasurface by changing the external electric field, so as to achieve the effect of an electrically adjustable reflective surface. ...

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Problems solved by technology

[0004] Purpose of the invention: The present invention aims to solve the above-mentioned deficiencies in the prior art, provide a terahertz metasurface that efficiently drives liquid crystal molecules, and solve the problem that only the overlapping parts of the upper and lower metal structures of the metasurface can be driven, and the rest of the metasurface cannot be formed perpendicular to the metasurface. electric field problem

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