Selective absorption filtering structure

Abstract

A selective absorption filtering structure comprises a substrate, a dielectric micro-nano unit located on the substrate and a metal layer located on the dielectric micro-nano unit. The metal layer totally covers the dielectric micro-nano unit, namely, the metal layer covers the ridge portion, the slot portion and the side wall of the dielectric micro-nano unit. The imaginary part of the dielectric constant of the metal layer needs to be larger than the absolute value of the real part of the dielectric constant. The filtering structure has relatively high absorption efficiency and is not sensitive to the angle and the polarization state of incident light. Meanwhile, manufacturing process is simple and easy to achieve. The structure can be applied to a solar cell to capture more energy and can provide a solution for achieving black in non-ink printing, and a traditional concept that black printing can be achieved only by means of pigments is changed.

Description

technical field [0001] The invention relates to an optical filter element, in particular to a selective absorption filter structure, which can be applied to the fields of light display, photovoltaic, solar cell, ink-free printing and the like. Background technique [0002] Selective absorption is mainly used in the fields of stealth, thermal emission, light display, photovoltaics, solar cells, and ink-free printing. For example: (1) In the field of printing, the traditional printing technology is to print images and colors on the surface of paper, plastic and other materials through inks of different colors. The existing problems are: it is easy to fade, and the ink contains harmful substances such as aromatic hydrocarbons, heavy metals, benzene, and ketones, which are very harmful to operators and the environment during the production and printing of the ink. Existing designs mainly focus on designing micro-nanostructures to achieve magenta, cyan, and yellow, and there is ...

AI Technical Summary

Problems solved by technology

The problem is that it is easy to fade, and the ink contains harmful substances such as aromatic hydrocarbons, heavy metals, benzene, and ketones, which are very harmful to operators and the environment during the production and printing of inks

[0004] The problems existing in the existing technology are: (1) Most of the designed structures work at a single wavelength, and the absorption efficiency at other wavelengths drops significantly, but broadband absorption is more valuable for stealth, thermal emission and energy conversion; ( 2) It is sensitive to the polarization state of the incident light, and the absorption efficiency degrades seriously in a wide range of incident angles; (3) The current selective absorber is mainly aimed at the microwave and terahertz bands, and is mainly used in detection, which limits its use in other field application

Although these two structures achieve selective absorption in a wide band and a wide range of incident angles, the preparation process is complicated.

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