Focal length-adjustable terahertz metasurface lens and preparation method and application thereof

Abstract

The invention discloses a focal length-adjustable terahertz metasurface lens and a preparation method and application thereof. The focal length-adjustable terahertz metasurface lens comprises a substrate and a dielectric layer which are oppositely arranged, a first electrode layer, a second electrode layer, a first orientation layer, a second orientation layer and a liquid crystal layer. A dielectric metasurface layer is arranged on the side, away from the substrate, of the dielectric layer, and the liquid crystal layer is arranged between the first orientation layer and the second orientationlayer; the first orientation layer and the second orientation layer have the same orientation direction are both have uniform orientations in a plane, and form an angle of 45 degrees with the transverse axis direction or the longitudinal axis direction; the orientation direction of the liquid crystal layer is induced by the orientation layer and is the same as the orientation direction of the orientation layer. Dynamic switching of the focal length of the lens can be realized through integration of the polarization multiplexing meta-lens and the electrically tunable liquid crystal wave plate,the dynamic switching of the function realizes the multifunctional adjustable terahertz meta-lens, and the technical problem of single function and application of the terahertz device in the prior art is solved.

Description

technical field [0001] The invention relates to an optical lens and its preparation method and application, in particular to a terahertz metalens with adjustable focal length and its preparation method and application. Background technique [0002] Currently, fifth-generation (5G) wireless networks have been gradually rolled out around the world, and it is necessary to accelerate fundamental research on next-generation (6G) communications. The 6G system's requirements for channel capacity far exceed today's requirements, so the terahertz (THz) frequency band, which has a higher carrier frequency than the radio frequency band, has great application prospects. The terahertz band is the last underexplored band of the electromagnetic spectrum, the so-called "terahertz gap", and many terahertz devices are far from mature. [0003] Lenses are critical components for coupling, focusing and collimating beams in communication systems. Traditional terahertz lenses are usually bulky,...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: One of the purposes of the present invention is to provide a terahertz metalens with adjustable focal length, which can realize dynamic tuning of different focal lengths under power-on conditions, so as to solve the functions and applications of terahertz lenses in the prior art A single technical problem; the second purpose of the present invention is to provide a method for preparing a focal length adjustable terahertz metalens; the third purpose of the present invention is to provide an application of a focal length adjustable terahertz metalens

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