Terahertz controller capable of switching absorption and filtering and method thereof

Abstract

The invention discloses a terahertz controller capable of switching absorption and filtering and a method thereof. The terahertz controller comprises N*N square unit structures, N is a natural number greater than 0, and the N*N square unit structures are periodically arranged on a plane perpendicular to the input direction of terahertz waves. Each unit structure sequentially comprises a metal layer, a dielectric layer and a germanium telluride layer from top to bottom; a top composite structure layer is located above the dielectric layer, and the germanium telluride layer is located below the dielectric layer; the composite structure layer is composed of a rectangular opening ring and a rectangular vertical bar; a first germanium telluride embedded strip is attached to the opening of the rectangular opening ring; and a second germanium telluride embedding strip and the second germanium telluride embedding strip are adhered between the rectangular opening ring and the rectangular vertical strip. The dielectric constant and the conductivity of germanium telluride are changed through external temperature application so that the function switching of absorption and filtering of the terahertz controller is realized. The terahertz controller capable of switching absorption and filtering has the characteristics of convenience in adjustment, flexibility in control, function conversion and the like, and meets the application requirements of a terahertz wave system.

Description

technical field [0001] The invention relates to a terahertz controller, in particular to a terahertz controller capable of switching absorption and filtering. Background technique [0002] Terahertz wave refers to the electromagnetic spectrum region between microwave and infrared light with frequency from 0.1THz to 10THz and wavelength from 3mm to 30μm. In recent years, the design of terahertz functional devices in the terahertz frequency band has been extensively studied by the scientific community. Various functional devices have been proposed, such as absorbers, filters, sensors, polarization controllers, etc. [0003] In the past period of time, limited by the fixed structure of the device, it was difficult for people to realize the dynamic regulation of the terahertz device. With the emergence and breakthrough of corresponding technologies, researchers have introduced tunable materials (graphene, liquid crystal, phase change materials, etc.) . However, these designs...

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Problems solved by technology

However, these designs only regulate a single performance, and there are relatively few studies on terahertz devices that realize multiple functions based on a single basic structure.

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