Dual-mode terahertz wave beam modulator based on medium metasurface, method and application

Abstract

The invention provides a dual-mode terahertz wave beam modulator based on a medium metasurface, a method and an application. The device comprises a plurality of metamaterial units arranged according to a certain rule, each metamaterial unit sequentially comprises a bottom VO2 layer, a dielectric isolation layer and a top VO2 layer from bottom to top, and centers of the bottom VO2 layer, the dielectric isolation layer and the top VO2 layer are superposed. The device is completely made of a dielectric material and does not contain a metal material, and the device can realize dynamic switching between a transmission mode and a reflection mode through thermal control or light control. In the reflection mode, the device efficiently reflects and splits terahertz waves, which is equivalent to a reflection type beam splitter. In the transmission mode, the device efficiently transmits the terahertz waves. Compared with other reflection type beam splitters, by using the device of the invention,when the device does not need to work as the beam splitter, an original transmission path of an incident wave is not changed, and the further transmission of the incident wave is not hindered. The device can be used for indoor terahertz communication so as to achieve the functions of communication range expansion, multi-terminal communication and the like.

Description

technical field [0001] The invention relates to the technical field of terahertz dynamic beam regulation, in particular to a dual-mode terahertz beam regulator based on a dielectric metasurface, a method and an application. Background technique [0002] Terahertz waves have the characteristics of low quantum energy, wide spectrum resources, good penetration and high transmission rate, making their applications in high-speed communications, radar and imaging, etc., attracting the attention of researchers at home and abroad. Especially after terahertz communication technology is designated for 6G technology applications, it has become an important research hotspot in the world. Since the terahertz wave is in a special frequency band between the infrared and microwave bands, the control devices that are more mature in microwave and optics have limited effects in the terahertz band. In recent years, the proposal and development of metasurfaces have made it easier and more effic...

AI Technical Summary

Problems solved by technology

However, the current terahertz beam splitters have the following disadvantages: 1) The current beam splitters all work in a single mode, and are basically reflective devices, and their signal coverage is only on one side of the device, which cannot achieve signal coverage in the entire space

When its work is not needed, the beam splitter itself will often become an obstacle for further signal transmission, especially when communication in the transmission direction is required, at this time the single-mode device cannot meet the corresponding communication range requirements

2) The current metasurface structures all use metal materials as the phase control unit, so the tunability of the device is poor, and the working mode switching cannot be realized according to the actual application; at the same time, the loss caused by the metal material is also relatively large, especially for the transmitted wave The modulation loss is more serious, which is extremely unfavorable for terahertz communication

Images