Abstract

In this paper, we take advantage of the high refractive index property of silicon to design a practical and sensitive plasmonic sensor on a photonic integrated circuit (PIC) platform. It has been demonstrated that a label-free refractive index sensor with sensitivity up to 1124 nm/RIU can be obtained using a simple design of a silicon nano-ring with a concentric hexagonal plasmonic cavity. It has also been shown that, with optimum structural parameters, a quality factor (Q-factor) of 307 and a figure of merit (FOM) of $234\,\,{{\rm{RIU}}^{- 1}}$ can be achieved, which are approximately 8 times and 5 times higher than the proposed sensors counterparts, respectively. In addition, the resonance mode of the hexagonal cavity with Si nano-ring (HCS) sensor can be adjusted to operate in the C-band, which is a highly desirable wavelength range in terms of compatibility with devices in PIC technology.

© 2023 Optica Publishing Group

Silicon-tapered waveguide for mode conversion in metal–insulator–metal waveguide-based plasmonic sensor for refractive index sensing

N. L. Kazanskiy, M. A. Butt, and S. N. Khonina
Appl. Opt. 62(32) 8678-8685 (2023)

Fano-resonance-based plasmonic refractive index sensor with high sensitivity for detection of urea

Gaurav Kumar Yadav and Sanjeev Kumar Metya
J. Opt. Soc. Am. B 41(1) 175-182 (2024)

Design of a plasmonic sensor based on a square array of nanorods and two slot cavities with a high figure of merit for glucose concentration monitoring

Mohammad Reza Rakhshani, Alireza Tavousi, and Mohammad Ali Mansouri-Birjandi
Appl. Opt. 57(27) 7798-7804 (2018)

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)

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)