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.
Polycrystalline ZnSe ceramics, an extreme difficult to machine material due to the inherent nature low hardness, low fracture toughness, and high brittleness, has been wildly used in the laser and infrared optics manufacturing field. However, the surface defects are inclined to nucleation and propagation through conventional single point diamond turning, the hybrid technology micro-laser-assisted machining (μ-LAM) has been proposed to combine the laser-assisted machining and ultra-precision single point diamond turning, which demonstrated the potential in improving the machining efficiency and surface integrity. In the study, comparative experiments have been conducted to verify the feasibility of μ-LAM on ZnSe ceramics. Furthermore, orthogonal experiments have been carried out to investigate the effect of machining parameters and laser parameters on surface quality and the optimum parameters subjected to the μ-LAM of ZnSe ceramics.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.