High extinction ratio subwavelength grating ring resonator

Lijun Huang; Xianwu Mi; Dajiang He; Shenghai Chen; La Xiang; Ni Zhou

doi:10.1117/12.2543203

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20 December 2019 High extinction ratio subwavelength grating ring resonator

Lijun Huang, Xianwu Mi, Dajiang He, Shenghai Chen, La Xiang, Ni Zhou

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Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 1120910 (2019) https://doi.org/10.1117/12.2543203
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

Compared with the conventional strip waveguide, subwavelength grating (SWG) waveguide has an enhanced evanescent field penetrating deeper within the upper cladding and the propagation direction, and an increased light-matter interaction can be achieved, resulting in a larger optical loss simultaneously. We experimentally demonstrate a subwavelength grating ring resonator around 1310nm. In order to reduce the influence of optical loss in the subwavelength bus waveguide and ring waveguide, we optimized the ring resonator by scanning the gap between the ring resonator and bus waveguide when the silicon duty cycle is fixed. The results experimentally show that the maximum extinction ratio of 18.8 dB when the gap and silicon duty cycle are equal to 120 nm and 0.7 around 1310nm. The extinction ratio has a 4.2dB larger than that for the resonance around 1550nm, which marks an increase of 28.7% compared to the C-band micro-ring sensors, thus showing a potential for bio-sensing applications in Lab-on-Chip system.

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Lijun Huang, Xianwu Mi, Dajiang He, Shenghai Chen, La Xiang, and Ni Zhou "High extinction ratio subwavelength grating ring resonator", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120910 (20 December 2019); https://doi.org/10.1117/12.2543203

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