Abstract

An all-subwavelength grating waveguide-based sensing structure for figure of merit (FOM) improvement on a silicon-on-insulator platform is proposed and demonstrated. Four racetrack resonators are applied to narrow the spectrum from the drop port of a single racetrack resonator for lower full width at half-maximum, and the FOM is therefore higher through the spectrum-narrowing operation. Numerical simulation and analysis illustrate that the proposed structure is able to raise the FOM more than twice compared to a single racetrack resonator, and a high FOM of 1850.57/refractive index unit is achieved.

© 2020 Optical Society of America

Nested micro-ring refractive index sensor based on a subwavelength grating waveguide and the Vernier effect

Xinyu Shi, Ming Chen, Renjie Li, Xiangyang Wang, Wenhao Han, Wanli Zhao, Jinbiao Liu, Chuanxin Teng, Shijie Deng, Yu Cheng, and Libo Yuan
Appl. Opt. 62(23) 6205-6211 (2023)

Ultrahigh-figure-of-merit refractive index sensor based on the Rayleigh anomaly resonance

L. Rahimi and A. A. Askari
Appl. Opt. 59(34) 10980-10985 (2020)

Improving the detection limit for on-chip photonic sensors based on subwavelength grating racetrack resonators

Lijun Huang, Hai Yan, Xiaochuan Xu, Swapnajit Chakravarty, Naimei Tang, Huiping Tian, and Ray T. Chen
Opt. Express 25(9) 10527-10535 (2017)

Numerical investigations of a near-infrared plasmonic refractive index sensor with extremely high figure of merit and low loss based on the hybrid plasmonic waveguide-nanocavity system

Lei Chen, Yumin Liu, Zhongyuan Yu, Dong Wu, Rui Ma, Yang Zhang, and Han Ye
Opt. Express 24(20) 23260-23270 (2016)

Numerical analysis of a near-infrared plasmonic refractive index sensor with high figure of merit based on a fillet cavity

Lei Chen, Yumin Liu, Zhongyuan Yu, Dong Wu, Rui Ma, Yang Zhang, and Han Ye
Opt. Express 24(9) 9975-9983 (2016)