All-dielectric metasurface terahertz photoconductive antenna based on embedded metal nanostructure

Abstract

The invention provides an all-dielectric metasurface terahertz photoconductive antenna based on an embedded metal nanostructure. The all-dielectric metasurface terahertz photoconductive antenna basedon the embedded metal nanostructure solves the problems that in the prior art, a terahertz photoconductive antenna generates terahertz waves, and the radiation power and the conversion efficiency arelow. The antenna comprises a semiconductor substrate, an all-dielectric anti-reflection metasurface array, a metal nanostructure array, a metal positive electrode and a metal negative electrode, wherein the all-dielectric anti-reflection metasurface array, the metal positive electrode and the metal negative electrode are arranged on the upper surface of the semiconductor substrate, and the all-dielectric anti-reflection metasurface array is located between the metal positive electrode and the metal negative electrode; the metal nanostructure array is arranged in the semiconductor substrate, and a distance exists between the metal nanostructure array and the upper surface of the semiconductor substrate.

Description

technical field [0001] The invention belongs to a terahertz photoconductive antenna, in particular to an all-dielectric metasurface terahertz photoconductive antenna based on an embedded metal nanostructure. Background technique [0002] Terahertz (THz) waves are electromagnetic radiation with a frequency between microwave and infrared bands, usually defined as electromagnetic waves with a frequency of 100GHz-10THz [1] . [0003] The unique spectral position of the terahertz wave makes it have the advantages of broadband, transmission and low energy, and has important application value in the fields of broadband communication, medical imaging, non-destructive testing and security inspection. [2] . [0004] As an important artificial terahertz source, terahertz photoconductive antenna (THz-PCA) can emit broadband terahertz radiation (covering the entire terahertz frequency band). It has important applications in material analysis and so on. [0005] The photoconductive an...

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Problems solved by technology

[0018] The purpose of the present invention is to solve the disadvantages of low radiation power and conversion efficiency of terahertz photoconductive antennas in the prior art, and provide a kind of all-dielectric metasurface terahertz photoconductive antenna based on embedded metal nanostructures

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