Band-pass filters for THz spectral range fabricated by laser ablation |
| |
Authors: | B Voisiat A Bi?iūnas I Ka?alynas and G Ra?iukaitis |
| |
Institution: | (1) School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1, Shinlim-dong, 151-742 Gwanak-gu, Seoul, South Korea; |
| |
Abstract: | The terahertz resonant metal-mesh filters were fabricated using the laser direct writing technique. UV picosecond laser was
employed to cut matrixes of cross-shaped holes in stainless steel foil and molybdenum layer deposited on polyimide substrate.
Different laser processing strategies were developed: holes were cut through in the metal foil and the molybdenum film was
removed from the polyimide by laser ablation. Band-pass filters with a different center frequency were designed and fabricated.
The regular shape, smoothness of edges and sharpness of corners of the cross-shaped holes in the metal were the main attributes
for quality assessment for the laser ablation process. Spectral characteristics of the filters, determined by the mesh period,
cross-arm length, and its width, were investigated by terahertz time-domain spectroscopy and conventional space-domain Fourier
transform spectroscopy. Experimental data were supported by three-dimensional finite-difference time-domain simulations. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|