Film with conical holes and preparation method

Abstract

The invention relates to a thin film with conical holes and a preparation method, and specifically relates to the field of optical films. A first silver film is arranged at one side of a substrate; asmall-ball structure layer is arranged on one side, far away from the substrate, of the first silver film; a second silver film is arranged on one side, far away from the first silver film, of the small-ball structure layer; the second silver film is provided with a plurality of conical holes enabling entrance of incident light; the diameter of one end of each conical hole close to the substrate is smaller than that of one end away from the substrate; a plurality of Fabry-Perot cavities are formed by gaps among a plurality of small balls in the first silver thin film, the second silver thin film and the small-ball structure layer; when light is taken into the Fabry-Perot cavities from the conical holes in the second silver film, the light is reflected for multiple times in the Fabry-Perotcavities, so that an electromagnetic field in the cavities is gathered, the abnormal transmission of the film is enhanced, and the light absorption of the film is enhanced.

Description

technical field [0001] The invention relates to the field of optical films, in particular to a film with tapered holes and a preparation method. Background technique [0002] The optical properties of the optical film are also very different due to the difference in its own structure. The common method of changing the optical film is to make holes on the optical film, and change the optical film according to the number, density and diameter of the holes. optical properties. [0003] In the prior art, the general method of making holes on the film is to use electron beam etching or focused ion beam etching to etch directly on the film to obtain a plurality of holes perpendicular to the film, so that the irradiation on the film The light is transmitted anomalously at the hole, thereby changing the optical properties of the optical film. [0004] However, due to the limited surface area of ​​the optical film, the number, density and diameter of the holes on the film are great...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a thin film with tapered holes and a preparation method for the above-mentioned deficiencies in the prior art, so as to solve the problems of electron beam etching and focused ion beam etching in the prior art. Expensive optics make the cost of making holes in the film higher, which is not conducive to production problems

Images