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Proceedings Paper

Analysis of SiNx TIR mirror for polygonal ring resonator sensor structure
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Paper Abstract

In this paper, total internal reflection (TIR) mirror is carefully simulated for silicon nitride polygonal ring resonator sensor structure. Polygonal resonator has recently attracted much attention for applications in bio and chemical sensors because it does not have a bending loss, and it has an advantage of using MMI coupler. In polygonal resonator sensor design, high Q-factor and low TIR mirror loss are extremely significant factors. Therefore, critical angle and Goos-Hanchen shift should be considered in the design of TIR mirror. When cladding material is SiO2, the critical angle of SiNx waveguide is about 44.99 degrees and the Goos-Hanchen shift is about 400 nm at 1.55 μm wavelength. For the rib type waveguide, we designed it to have 3 μm width, 1 μm height, and 0.5 μm etching depth for decreasing TIR mirror loss. As simulation results of FDTD, reflectivitities of polygonal TIR mirrors are 79% for pentagon, 95% for hexagon and 98% for octagon, respectively. According to the simulations, Q-factors for hexagonal and octagonal resonators can be obtained as high as 1.55 x 104 and 1.72 x 104, respectively.

Paper Details

Date Published: 22 February 2017
PDF: 7 pages
Proc. SPIE 10098, Physics and Simulation of Optoelectronic Devices XXV, 100981M (22 February 2017); doi: 10.1117/12.2250486
Show Author Affiliations
Jun-Hee Park, Chung-Ang Univ. (Korea, Republic of)
Myung-Gi Ji, Chung-Ang Univ. (Korea, Republic of)
Su-Jin Jeon, Chung-Ang Univ. (Korea, Republic of)
Ji-Hoon Kim, Chung-Ang Univ. (Korea, Republic of)
Young-Wan Choi, Chung-Ang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 10098:
Physics and Simulation of Optoelectronic Devices XXV
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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