A Terahertz Amplitude Modulator Based on Flexible Metamaterials

Abstract

The invention discloses a terahertz amplitude modulator based on flexible metamaterials, belonging to the technical field of electromagnetic functional devices. Including a flexible substrate and a unit modulation structure layer completely deposited on the flexible substrate; the unit modulation structure layer is composed of m amplitude modulation unit structures arranged sequentially in a replica translation mode, where m≥1; the amplitude modulation unit structure Including metal structure and vanadium dioxide; the metal structure is an "I"-shaped structure composed of 2 horizontal bars and 1 vertical bar; the vertical bar is a dipole resonant bar with an opening in the middle, and the opening divides the vertical bar into upper vertical bars and the lower vertical bar, the ends of the upper vertical bar and the lower vertical bar are connected with metal branches; the vanadium dioxide is filled in the opening to communicate with the upper vertical bar and the lower vertical bar. The terahertz amplitude modulator provided by the present invention realizes the dynamic control of the amplitude on a curved surface with any curvature, and has the characteristics of simple structure, easy manufacture, good tuning effect and stable tuning function.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, focuses on dynamic functional devices in the terahertz band, and in particular relates to a terahertz amplitude modulator based on flexible metamaterials. Background technique [0002] At present, tunable terahertz devices are not only a hot direction of device research, but also a development trend of future device research. The research on tunable devices based on metamaterials usually changes the frequency or amplitude of the resonance point based on different external conditions such as electric field, magnetic field, temperature, optical excitation, etc. Design tunable terahertz modulators such as controlling the conductivity of photoconductive semiconductor materials by laser, or controlling the resistance of superconducting materials by temperature. This is more cost-effective than obtaining tunability by changing the size of the structure in the past. It does n...

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Problems solved by technology

[0006] In view of the deficiencies in the background technology, in order to solve the poor modulation effect of existing terahertz modulators based on flexible substrates, especially the problems of weak adjustability and low stability on curved surfaces, the present invention provides a terahertz modulator based on flexible ultra- The terahertz amplitude modulator of the material uses a flexible material as the substrate, fills the vanadium dioxide in the metal structure, makes an array of amplitude modulation unit structures and deposits them on the flexible substrate, and realizes the amplitude on the curved surface of any curvature. Tuning, with the characteristics of simple structure and easy production, good modulation effect and strong stability

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