Reconfigurable TeraHertz wave super-diffraction focusing device based on voltage regulation and control

Abstract

The invention discloses a reconfigurable TeraHertz wave super-diffraction focusing device based on voltage regulation and control, relates to the technical field of TeraHertz wave focusing, and solvesthe problems that an existing TeraHertz wave technology is based on a near-field optics principle although super-resolution focusing is realized, and focal length is extremely small so as to be difficult in meeting far-field high-resolution optical focusing requirements of application fields including biomedical imaging, remote sensing, security check and the like. The device has the technical scheme key point that the device comprises a silicon layer and a plurality of graphene layers abutted against the surface of the silicon layer, wherein the graphene layers are annular and are concentrically arranged, and adjacent graphene layers have the same interval; an insulation layer abutted against the silicon layer is arranged between the adjacent graphene layers; an electric conduction layercoats the surface of the insulation layer; and two sides of the electric conduction layer are independently abutted against the adjacent graphene layers. TeraHertz wave diffraction limitation is broken through, and a far-field high-resolution optical focusing effect is achieved.

Description

technical field [0001] The invention relates to the technical field of terahertz wave focusing, more specifically, it relates to a reconfigurable terahertz wave super-diffraction focusing device based on voltage regulation. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency of 0.1-10 THz. This band contains rich spectral information, such as the rotation / oscillation spectrum of macromolecules including proteins, and the lattice vibration energy spectrum of solid materials. Compared with microwaves and light waves, terahertz waves have the characteristics of low energy, strong penetrating power, high safety, and rich spectral information, and have important application prospects in nondestructive testing, security inspection, medical imaging, and communication. [0003] The development of terahertz technology has put forward higher requirements for the focusing spot and imaging resolution in the terahertz band. In recent years, some...

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Problems solved by technology

[0004] Although the existing terahertz wave technology has achieved super-resolution focusing, they are all based on the principle of near-field optics, and the focal length is extremely small, which is difficult to meet the requirements of far-field high-resolution optical focusing in biomedical imaging, remote sensing, security inspection and other application fields.

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