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Proceedings Paper

A sensitive coupling structure for terahertz detectors array
Author(s): Peng Xiao; Xuecou Tu; Chengtao Jiang; Chao Wan; Zhou Jiang; Shimin Zhai; Min Gu; Xiaoqing Jia; Lin Kang; Jian Chen; Peiheng Wu
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Paper Abstract

In order to effectively improve the coupling efficiency of terahertz (THz) detectors, we design a grating-coupled structure on the high-resistivity silicon substrate for 0.2 THz to 0.35 THz band to enhance the ability of coupling terahertz signals. We simulated the electric field distribution of the grating-coupled structure in surface and inside by using the finite difference time domain (FDTD) method. The electric field in the central area of the silicon surface can be enhanced more than 4 times compared with the non-structure silicon substrate. We also simulated the Fabry-Perot cavity in the frequency range from 0.2 THz to 0.35 THz, and the electric field in the central area of the silicon surface can be improved one time compared with the non-structure silicon substrate. In addition, the electric field distribution on the silicon surface can be changed by adjusting parameters of the grating-coupled structure. When the period of the grating is 560 μm, the width of the gold is 187 μm, and the thickness of the silicon substrate is 720 μm, a 4.7 times electric field could be achieved compared with the non-structure silicon substrate at 0.27 THz and around. So, the simulation result shows that the grating-coupled structure has an obvious advantage compared with the Fabry-Perot cavity at THz coupling efficiency.

Paper Details

Date Published: 24 February 2017
PDF: 6 pages
Proc. SPIE 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X, 101031R (24 February 2017); doi: 10.1117/12.2251387
Show Author Affiliations
Peng Xiao, Nanjing Univ. (China)
Xuecou Tu, Nanjing Univ. (China)
Chengtao Jiang, Nanjing Univ. (China)
Chao Wan, Nanjing Univ. (China)
Zhou Jiang, Nanjing Univ. (China)
Shimin Zhai, Nanjing Univ. (China)
Min Gu, Nanjing Univ. (China)
Xiaoqing Jia, Nanjing Univ. (China)
Lin Kang, Nanjing Univ. (China)
Jian Chen, Nanjing Univ. (China)
Peiheng Wu, Nanjing Univ. (China)


Published in SPIE Proceedings Vol. 10103:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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