Adjustable dual-frequency terahertz absorber
A terahertz and absorber technology, applied in the field of terahertz wave absorbers, can solve the problems of non-adjustable absorption function, high cost, restricting the application of absorbers, etc., and achieve the effects of novel control method, high absorption rate, compact and novel structure
Inactive Publication Date: 2019-09-27
中国计量大学上虞高等研究院有限公司
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Problems solved by technology
[0003] The terahertz wave absorbers currently researched at home and abroad mainly realize the absorption of terahertz waves by designing metal microstructures with different geometric shapes and size parameters. Once the absorption function of the device is determined, it cannot be adjusted, which restricts the absorber. application, and the higher cost
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Embodiment 1
[0026] In this embodiment, the structure of the adjustable dual-frequency terahertz absorber and the shape of each component are as described above, so details are not repeated here. However, the specific parameters of each component are as follows: the structural material in the tungsten diselenide pattern is tungsten diselenide, the long axis of the ellipse in the first cross pattern is 10 μm, and the short axis is 4 μm; the long axis of the ellipse in the second cross pattern is 11.5 μm, the minor axis is 4.6 μm; the major axis of the ellipse in the third cross pattern is 13 μm, the minor axis is 5.2 μm; the major axis of the ellipse in the fourth cross pattern is 14.5 μm, the minor axis is 5.8 μm; each cross pattern Both have a thickness of 1 nm. The material of the tungsten diselenide wire is tungsten diselenide, the length of the tungsten diselenide wire is 46 μm, the width is 1 μm, and the thickness is 0.34 nm. The metal electrodes on both sides have a length and width...
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Abstract
The invention discloses an adjustable dual-frequency terahertz absorber which comprises a tungsten diselenide pattern, a tungsten diselenide wire, metal electrodes, a dielectric layer and a metal substrate, wherein the tungsten diselenide pattern, the tungsten diselenide wire and the metal electrodes are located on the top layer; the tungsten diselenide pattern is composed of four crossed patterns having the same style and greatly increased sizes and arranged in a 2*2 array; each crossed pattern is formed by two crossed identical concentric ellipses; the crossed patterns are connected through the tungsten diselenide wire and are divided by the tungsten diselenide into two groups; the respective groups are connected with different metal electrodes; the two groups are independent of each other; the dielectric layer is located under the tungsten diselenide pattern; the metal substrate is located under the dielectric layer; and the metal electrode and the metal substrate are connected through a voltage source. The Fermi level of tungsten diselenide is adjusted by an applied electric field, thereby changing the center frequency and the absorption efficiency of an absorption peak, and achieving dual-band absorption of a tunable terahertz wave. The adjustable dual-frequency terahertz absorber of the invention is compact in structure, high in absorption rate, simple in control method and simple in principle, and can be used for terahertz wave detection.
Description
technical field [0001] The invention relates to a terahertz wave absorber, in particular to an adjustable dual-frequency terahertz absorber. Background technique [0002] In recent years, the terahertz wave between the millimeter wave and infrared light, which has been developed quite maturely on the electromagnetic spectrum, is undoubtedly a brand-new research field, and it has great potential value in all aspects. The frequency of terahertz wave is 0.1~10THz, and the corresponding wavelength is 0.03mm~3mm. For a long time, due to the lack of effective terahertz wave generation and detection methods, compared with traditional microwave technology and optical technology, people have little understanding of the nature of electromagnetic radiation in this band, so that this band has become the terahertz wave in the electromagnetic spectrum. void. With the breakthrough of terahertz radiation source and detection technology, the unique and superior characteristics of terahertz...
Claims
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Login to View More IPC IPC(8): H01Q17/00G02B5/00
CPCG02B5/003H01Q17/008
Inventor 李九生陈旭生李达
Owner 中国计量大学上虞高等研究院有限公司