An optically transparent frequency selective surface structure and its manufacturing method

Abstract

The invention provides an optical transparent frequency selecting surface structure and a manufacturing method, and belongs to the technical field of optical windows. The frequency selecting surface structure comprises a substrate and transparent mesh films which are distributed on the surface of the substrate and are provided with periodic hole arrays. The manufacturing method comprises the following steps of coating the upper surface of the substrate by using mask liquid; naturally drying the mask liquid to form a crack template under specific conditions; depositing a conductive metal layer on the surface of the crack template; removing the crack template to obtain the continuous transparent mesh films; manufacturing hole array mask structures or complementary structures thereof on the transparent mesh films; removing the transparent mesh films which are not wrapped by the mask structures; and removing the mask structures to obtain the optical transparent frequency selecting surface structure. By the optical transparent frequency selecting surface structure, the problem that the light transmittance performance of an optical window is reduced due to increasing of a metal line width is solved, the circumstance that the light transmittance performance and the electromagnetic shielding performance of the optical window are reduced simultaneously in the traditional mechanical friction mode is avoided, and specific processing conditions for solving the problem of non-uniform distribution of high-order diffraction energy are given.

Description

technical field [0001] An optically transparent frequency selective surface structure and a manufacturing method belong to the technical field of optical windows. Background technique [0002] Optical windows are widely used in telemetry and remote sensing, medical diagnosis, secure communication, aerospace equipment and other fields. Traditional optical windows are pure electromagnetic wave transmission windows. However, the continuous growth of electrical equipment will not only greatly increase the intensity of electromagnetic waves, but also broaden the wave band of electromagnetic waves, resulting in the deterioration of the space electromagnetic environment. Because traditional optical windows are transparent to electromagnetic waves, the deterioration of the electromagnetic environment May adversely affect electromagnetically sensitive equipment. In order to reduce electromagnetic interference, an electromagnetic shielding function needs to be added to the optical w...

AI Technical Summary

Problems solved by technology

[0011] In view of the above shortcomings and deficiencies, the present invention discloses an optically transparent frequency selective surface structure and a manufacturing method, which not only avoids the use of titanium dioxide solution, but also avoids the problem of reducing the light transmission performance of the optically transparent frequency selective surface structure due to the increase of the metal line width, And there is no need to use mechanical friction to remove the template, avoiding the traditional mechanical friction while reducing the light transmission performance and electromagnetic shielding performance of the optically transparent frequency selective surface structure, and also provides specific processing conditions that can solve the problem of uneven distribution of high-order diffraction energy. The optically transparent frequency selective surface structure produced by the method of the present invention not only has good electromagnetic shielding performance, but also achieves the effect of no obvious diffraction when solving the problem of uneven distribution of high-order diffraction energy, and has good light transmission performance

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