Terahertz metasurface for efficiently driving liquid crystal molecules

A liquid crystal molecule, high-efficiency driving technology, applied in antennas, instruments, optics, etc., can solve the problem that the rest of the parts cannot form an electric field perpendicular to the metasurface, and achieve the effect of improving the upper limit of performance

Active Publication Date: 2021-06-25
NANJING UNIV OF POSTS & TELECOMM
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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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  • Terahertz metasurface for efficiently driving liquid crystal molecules
  • Terahertz metasurface for efficiently driving liquid crystal molecules
  • Terahertz metasurface for efficiently driving liquid crystal molecules

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Embodiment Construction

[0022] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] Depend on figure 1 It can be seen that the terahertz metasurface for efficiently driving liquid crystal molecules according to the present invention includes 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, a bottom metal layer is coated on the top surface of the bottom quartz layer; the top metal layer includes metasurface units arranged in an array, and the metasurface units include resonant ring groups. The resonant ring group includes a split resonant ring and two closed resonant rings; the two closed resonant rings are arranged around the split resonant ring from inside to outside, and the center of each resonant ring coincides with the center of ...

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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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00G02F1/13
CPCH01Q15/0026G02F1/1313
Inventor 刘水许锋
Owner NANJING UNIV OF POSTS & TELECOMM
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