A DAST-based Salisbury screen flexible terahertz absorber and its preparation method

Abstract

The invention discloses a DAST-based Salisbury screen flexible terahertz wave absorber and a preparation method thereof. The Salisbury screen flexible terahertz wave absorber is composed of a surface DAST organic material layer, an intermediate medium film layer and a bottom metal film layer. Structural composition, the surface DAST organic material layer is one of DAST organic single crystal or DAST organic thin film, the DAST organic single crystal or DAST organic thin film has absorption in the terahertz band, and the three-layer structure satisfies Salisbury The impedance matching conditions of the screen terahertz absorber; the strong terahertz absorption of the surface DAST organic material layer is used to make it have a high AC conductivity, and by designing the overall structure size, the Salisbury screen flexible terahertz absorber and freedom The spatial impedance matching minimizes the reflection of the entire Salisbury screen flexible terahertz absorber structure, and converts the energy absorbed by the structure into heat energy inside the surface DAST organic material layer, so that the Salisbury screen flexible terahertz absorber can obtain 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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