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An electrically/optically tunable terahertz dual-frequency absorber based on phase change materials

A phase change material and terahertz technology, which is applied in the terahertz field, can solve the problems that the position of the center frequency cannot be adjusted, limit the application range of the terahertz absorber, etc., and achieve the effect of improving the performance and expanding the application range.

Active Publication Date: 2022-07-26
GUILIN UNIV OF ELECTRONIC TECH
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  • Claims
  • Application Information

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Problems solved by technology

At present, most terahertz absorbing devices can perfectly realize the perfect absorption of terahertz waves in a single specific band, but at the same time, they can only absorb for a single specific terahertz wave frequency, and their center frequency positions cannot be adjusted. This greatly limits the practical application range of terahertz absorbers

Method used

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  • An electrically/optically tunable terahertz dual-frequency absorber based on phase change materials
  • An electrically/optically tunable terahertz dual-frequency absorber based on phase change materials
  • An electrically/optically tunable terahertz dual-frequency absorber based on phase change materials

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Embodiment Construction

[0031] The solution of an electrical / optical tunable terahertz dual-frequency absorber based on a phase change material of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The schematic diagram of the embodiment of the electrical / optical tunable terahertz dual-frequency absorber based on the phase change material is as follows figure 1 and 2 As shown, it includes a metal substrate 1, a high-resistance silicon layer 2 on the metal substrate 1, and a two-dimensional array 4 fixed on the surface of the high-resistance silicon layer. The diameter of the normally incident terahertz beam in this example is 500 microns, and the two-dimensional array 4 in this example has a total of 13×8 array elements, and the side length is 1300 microns×800 microns.

[0033] In this example, the length and width of the metal substrate 1 and the high-resistance silicon layer 2 are larger than those of the two-dimens...

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Abstract

The present invention is an electrical / optical tunable terahertz dual-frequency absorber based on vanadium dioxide, which is mainly characterized by comprising a metal substrate, a high-resistance silicon layer on the metal substrate, and a high-resistance silicon layer fixed on the surface of the high-resistance silicon layer. A two-dimensional array, each array unit includes a small-sized square split-ring metal structure, a large-sized square split-ring metal structure, 2 phase change pads and 1 lead. The upper phase change gasket is located at the opening of the small-sized square split ring metal structure on the upper side of the lead in the unit, and the lower phase change gasket is located at the opening of the large-sized square split ring metal structure on the lower side of the lead in the unit. One electrode is fixed on each side of the two-dimensional array, and the positive and negative electrodes of the DC power supply are respectively connected. There are two kinds of tuning trigger modes of the absorber, electrical triggering and laser triggering. The invention can realize the fast and effective tuning of the terahertz dual-frequency absorber by electricity / optics, does not need to tediously replace the terahertz absorber with different absorption frequencies, is suitable for different occasions, and is simple to operate.

Description

(1) Technical field [0001] The invention relates to the technical field of terahertz, in particular to an electrical / optical tunable terahertz dual-frequency absorber based on phase change materials. (2) Background technology [0002] Terahertz (Terahertz, THz for short) refers to electromagnetic waves with a frequency range of 0.1THz to 10THz between microwave and infrared spectrum (1THz=10 12 Hz), terahertz (terahertz: THz) electromagnetic waves have the advantages of good security, high spectral information content, strong penetration and wide frequency bandwidth, etc., and have extremely broad application prospects in communications, biomedicine, material identification, and national defense and military. Therefore, studying the special band of THz is of great value for exploring the interaction between electromagnetic fields and matter, and developing corresponding functional devices and application technologies. However, due to the lack of current terahertz devices, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/007H01Q17/008
Inventor 刘铁园常亮胡放荣刘永琛
Owner GUILIN UNIV OF ELECTRONIC TECH
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