Wideband bidirectional wide-angle absorbing structure and preparation method thereof

Abstract

The invention relates to a wideband bidirectional wide-angle absorbing structure comprising a moth-eye nanostructure array. The moth-eye structure has a bottom-width-to-top-width ratio greater than 1to 1. The surface of the moth-eye structure is covered with a metal layer. The moth-eye nanostructure array has a period of 200 to 450 nm, a ratio of height to period greater than 2, and a ratio of width to period greater than 0.5. A preparation method of the broadband bidirectional wide-angle absorbing structure comprises the steps of: obtaining a moth-eye nanostructure on a base material by photoetching or replicating anodic aluminum oxide; and depositing metal on the upper surface of the moth-eye nanostructure by evaporation or magnetron sputtering. The structure effectively absorbs electromagnetic waves input from the upper surface and the lower surface, and realizes ultra-wideband bidirectional high-efficiency absorption (>95%) from the ultraviolet band to the near-infrared band, hasnot only a polarization-insensitive characteristic but also good angular tolerance, and can achieve bidirectional absorption efficiency of 90% in a range of + / - 60-degee angle of incidence. The wideband bidirectional wide-angle absorbing structure is simple in structure, low in preparation cost and convenient in large-scale and batch production.

Description

technical field [0001] The invention relates to the technical field of nanostructures, in particular to a broadband bidirectional wide-angle wave absorbing structure and a preparation method thereof. Background technique [0002] After Landy et al. proposed the perfect metamaterial absorber, researchers have proposed many absorbing structures to achieve different absorbing properties for thermal imaging, solar cells, plasma sensors, bolometers, wireless energy transmission and other fields. Such as narrow-band absorption, multi-band absorption, broadband absorption, polarization-insensitive absorption, wide incident angle absorption, adjustable bandwidth absorption, etc. At present, the research on perfect absorption mainly focuses on the GHz, THz and infrared bands. With the continuous improvement of micro-nano preparation technology, researchers gradually turn their attention to the visible and ultraviolet wavelengths, and explore the perfect absorption of ultraviolet to ...

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Problems solved by technology

For example, the patent with the authorized notification number CN105480931B [A Visible Light Two-way Absorber Structure] discloses a two-way visible light wide-band absorber, which is formed by covering a metal layer and a dielectric layer with a two-dimensional nanostructure. And the average absorption efficiency below is less than 90%, but the working band is limited to the visible band

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