Visible-near-infrared region wide-band perfect absorber and preparation method thereof

Abstract

The invention relates to a visible-near-infrared region wide-band perfect absorber. The visible-near-infrared region wide-band perfect absorber includes a substrate, a metal film layer and a metal-dielectric conical cylindrical composite structural layer; the metal-dielectric conical cylindrical composite structural layer is arranged on the metal film layer; and the metal film layer is arranged onthe substrate. With the visible-near-infrared region wide-band perfect absorber of the invention adopted, problems such as internal metal ohmic loss, thermal effect and thermal instability can be effectively avoided; the wide-band absorption of visible-near-infrared bands can be realized; and plasmon resonance modes within in a plurality of frequency ranges are generated, so that a wide-band electromagnetic wave perfect absorption characteristic can be obtained. The visible-near-infrared region wide-band perfect absorber of the invention has a wide application prospect in the fields of photoelectric devices such as infrared detection and photoelectric conversion devices, infrared imaging devices, solar anti-reflection coatings and heat radiators under high-temperature and high-heat conditions.

Description

technical field [0001] The invention relates to the fields of photoelectric functional materials and devices, solar photovoltaics and thermal radiation, and in particular to a wide-band perfect absorber in the visible-near-infrared region and a preparation method thereof. Background technique [0002] Surface plasmon resonance (SPR) usually refers to the collective oscillation caused by free electrons on the surface of metal microstructures under the irradiation of electromagnetic waves, forming a local electromagnetic field enhancement effect on the metal surface. [0003] Metamaterials refer to artificially designed and manufactured composite materials with periodic structural properties. In recent years, their research has rapidly become a frontier interdisciplinary field of physics, functional technology and material science. [0004] The concept of a perfect absorber was first proposed in 2008 ("Physical Review Letters", Vol. 100, p. 207402), which is a device based on ...

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Problems solved by technology

However, in these perfect absorber systems, only electromagnetic waves of a single resonance wavelength can be absorbed, which is a narrow-band light absorption

In addition, these electromagnetic wave perfect absorber systems are all based on noble metal materials (such as gold and silver). The coupling of electromagnetic waves is realized through the free electron oscillation modes of these metal materials. These free electron oscillations will inevitably lead to strong ohmic losses and thermal effects, which are not conducive to The structural stability of metal micro-nano materials also limits the application prospects of such absorbers under high-intensity electromagnetic wave irradiation

The Chinese invention patent discloses a titanium-based solar selective absorption coating, but the absorption coating has a narrow wavelength range with high absorption efficiency and a complex structure, requiring close configuration of structural units such as heat absorbers, anti-reflection layers, and absorption layers

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