Two-step randomized design of multi-rings metallic mesh for ultra-uniform diffraction distribution. (December 2021)

• Record Type: Journal Article
• Authors: Lu, Zhengang; Zhang, Yilei; Lu, Xi; Wang, Heyan; Tan, Jiubin
• Is Part Of: Optics & laser technology. Volume 144(2021)
• Publication Date: 2021-12
• Subjects: Metallic mesh -- Transparent conductor -- Electromagnetic interference shielding -- Optical transparency -- Uniform diffraction; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2021.107396
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: A new random multi-rings metallic mesh with two-step randomized design process was designed for ultra-uniform diffraction distribution. Compared with traditional triangular ring mesh, the random multi-rings metallic mesh can decline by 85.96 % on the maximum high-order diffraction energy experimentally, making it favorable for high-imaging-quality optical windows and display screens. The metallic mesh can simultaneously achieve excellent microwave electromagnetic shielding and high optical transmittance. The design strategy of the two-step randomization can be extended to other kinds of metallic mesh to homogenize high-order diffraction. Abstract: We propose a random multi-rings metallic mesh (RMR-MM) with the two-step randomized design process. By randomly shrinking the radii and changing the center positions of the basic rings, adding and interrupting the external common tangent rings, filling random sub-rings and supplementary rings, the superposition probability of diffraction spots generated by the multi-rings is reduced to a ultra-low level and thus ultra-uniform diffraction pattern is achieved. Experiment shows that the maximum high-order diffraction energy of RMR-MM experience an 85.96% drop from that of traditional triangle-distributed basic ring mesh, while the average normalized visible transmittance as high as 95.76% in 400–700 nm is achieved. In addition, the 200-nm-thick aluminum RMR-MM exhibits an electromagnetic shielding effectiveness of over 17.5 dB in the Ku-band. These excellent properties indicate RMR-MM is favorable in transparent electrodes as well as electromagnetic interference shielding application for optically transparent devices.