Metallic mesh is widely used in the window and domes of infrared optical system of weapon equipment, the fabrication of planar metallic mesh has been relatively mature. However, it is difficult to prepare the mesh with several microns linewidth uniformly on the concave structure with large curvature. Here we designed and fabricated copper film metal grid with high optical transmittance and strong electromagnetic shielding effect on large concave surface by laser direct writing lithography. It achieves an average shielding efficiency of ~ 27.84 dB in 2-12 GHz frequency band, optical transmittance of ~ 90% in the near infrared band. The simulation and experiment has good uniformity. Our results may provide new ideas for the preparation of the electromagnetic interference shielding metallic mesh. It can improve the service life of weapon equipment receiving window and the ability of infrared imaging tracking and anti-electromagnetic interference.
The design and production of metallic mesh based on germanium substrate were investigated to satisfy the electromagnetic shielding requirements of germanium optical windows. Through theoretical analysis of the effect of metallic mesh structure on optical transmittance and electromagnetic shielding effectiveness, CST software is used to simulate the effect of metallic mesh period, thickness and substrate resistivity on electromagnetic shielding. According to the simulation results, appropriate parameters are selected to prepare the mesh microstructure. The mesh structure that meets the requirements was produced using laser direct writing lithography. The metallic mesh microstructure has a 400 μm period and a 12μm line width. The eight to 12μm bands measured by the infrared spectrometer had an 87.1% transmissivity. The lowest electromagnetic shielding efficacy is greater than 28.1dB, while the average electromagnetic shielding efficiency of the 240MHz to 18GHz range is assessed by the vector network analyzer at 34.4 dB. This paper describes the simulation and fabrication of metallic mesh microstructures on germanium substrates. These microstructures have excellent optical and electrical properties, which is very important for the creation of optical windows with high optical transmittance and potent electromagnetic shielding.
Graphene oxide (GO) is a precursor material for producing graphene. The electrical and optical properties of GO can be modified by reduction of the oxygen-containing groups. In this report, we have prepared graphene oxide polymers (GO-polymer) with different vol. % of GO and reduced the polymer by direct laser writing. We have found the refractive index modulation of the GO-polymer up to 10^(-1) for 15 vol.%.
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