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11 November 2014 Terahertz polarization conversion of metallic meanderline structures on the different thickness of polymide substrates
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Abstract
In this paper, we have investigated the polarization dependence of terahertz wave through the metallic meanderline structure on the different thicknesses of polyimide substrate. The meanderline wave plates are designed by using software of CST Microwave Studio. The 200 nm thickness of gold film is used as metallic layer deposited on the polyimide substrate with different thicknesses. The ellipticity η is obtained by the simulating transmission and phase, η=0 corresponds to linearly polarized transmission, while η=1 and -1 corresponds to left-handed and right-handed circular polarization. The intermediate value of η indicates the elliptically polarization. The simulation results show that the absolute value of ellipticity reach the maximum of 0.999 at 0.505THz, 0.479THz and 0.391THz when the substrate thickness t=10μm, 30μm and 60μm, respectively. In addition, the metallic microstructure of meanderline displays a large bandwidth of THz operation. The ellipticity is over 99% in the THz band of 457 GHz to 532 GHz, 426 GHz to 508 GHz, 356 GHz to 486 GHz corresponding to the above three kind of substrate thicknesses. The bandwidth increases and shows red shift with increasing of substrate thickness. These results provide a reference for the design and manufacture of THz polarization conversion device.
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Chang Gu, Guozhong Zhao, Ruirui Huang, and Kuan Kou "Terahertz polarization conversion of metallic meanderline structures on the different thickness of polymide substrates", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 92750L (11 November 2014); https://doi.org/10.1117/12.2073956
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