Salisbury screen flexible Terahertz microwave absorber based on DAST and preparation method thereof

Abstract

The invention discloses a Salisbury screen flexible Terahertz microwave absorber based on DAST and a preparation method thereof. The absorber comprises a surface-layer DAST organic material layer, anintermediate thin film layer and a base layer metal thin film layer. The surface-layer DAST organic material layer is one kind of a DAST organic single crystal or a DAST organic thin film. The DAST organic single crystal or the DAST organic thin film absorbs waves in the Terahertz waveband. The three layers meet the impedance matching condition of the Salisbury screen flexible Terahertz microwaveabsorber. By use of the Terahertz wave absorption of the DAST organic material layer, the absorber has quite high alternating current conductivity. By designing the whole structure size, impedance matching of the Salisbury screen flexible Terahertz microwave absorber and the free space is achieved; the reflection of the whole Salisbury screen flexible Terahertz microwave absorber structure is allowed to be smallest; and energy absorbed by the structure is converted into thermal energy in the surface-layer DAST organic material layer, so the Salisbury screen flexible Terahertz microwave absorber is allowed to acquire excellent Terahertz absorption performance.

Description

technical field [0001] The invention belongs to the technical field of terahertz, and in particular relates to a DAST-based Salisbury screen flexible terahertz wave absorber and a preparation method thereof. Background technique [0002] Terahertz (THz for short) usually refers to electromagnetic waves with a frequency in the range of 0.1-10 THz. Terahertz has high transparency, so it can be applied in the field of non-destructive testing in the process of security inspection or quality inspection. Moreover, terahertz has low energy and will not cause photoionization to destroy the substance to be tested, so it is very suitable for biopsy of human body or other biological samples. In addition, terahertz also has fingerprint spectrum. Therefore, terahertz detection technology can not only detect the shape of objects, but also identify the components of objects and analyze the physical and chemical properties of objects. Due to these unique advantages of terahertz, terahert...

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Problems solved by technology

[0005] The object of the present invention is to: aim at the phenomenon that the surface layer of the above-mentioned existing wave absorber is a metal film layer, the production time that causes is long, the cost is high and when the thickness of the metal film layer is below 1nm, due to defects, grain boundaries and surface The scattering of electrons makes the AC conductivity of the metal film smaller, and it is difficult to meet the impedance matching problem of the terahertz absorber. The invention provides a DAST-based Salisbury screen flexible terahertz absorber and its preparation method

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