Abstract

Dielectric grating–based surface plasmon resonance (SPR) sensors with self-referenced capability are relatively less explored. A self-referenced SPR sensor incorporating titanium oxide (${\mathrm{TiO}}_2$) grating on thin gold (Au) film atop dielectric substrates is proposed in the optical communication band. The rigorous coupled wave analysis (RCWA) method is used for sensor simulation and evaluation of performance parameters. The finite-element method-based field strength analysis is performed to study the behavior of two plasmon modes (analyte mode and substrate mode) at respective resonance conditions. Further, the influence of various grating variables on sensor performance is analyzed. As a major result, in the optical communication band, an average spectral sensitivity and SPR curve width of 693.88 nm/RIU and 26.03 nm, respectively, are achieved for the optimized values of grating variables. Proposed ${\mathrm{TiO}}_2$ grating on Au film atop ${\mathrm{SiO}}_2$ substrate can provide greater sensitivity than the existing grating-based plasmonic sensors for a broad range of analyte refractive indices.

© 2019 Optical Society of America

Self-referenced biosensor based on thin dielectric grating combined with thin metal film

Mohammad Abutoama and Ibrahim Abdulhalim
Opt. Express 23(22) 28667-28682 (2015)

Sensitivity enhancement of a graphene–barium titanate-based surface plasmon resonance biosensor with an Ag–Au bimetallic structure in the visible region

Lili Liu, Mei Wang, Lipeng Jiao, Ting Wu, Feng Xia, Meijie Liu, Weijin Kong, Lifeng Dong, and Maojin Yun
J. Opt. Soc. Am. B 36(4) 1108-1116 (2019)

Theoretical and experimental study of a highly sensitive SPR biosensor based on Au grating and Au film coupling structure

Haoyuan Cai, Mengwei Wang, Jing Liu, and Xiaoping Wang
Opt. Express 30(15) 26136-26148 (2022)

Microchannel-based plasmonic refractive index sensor for low refractive index detection

Emranul Haque, Md. Anwar Hossain, Yoshinori Namihira, and Feroz Ahmed
Appl. Opt. 58(6) 1547-1554 (2019)

Numerical study on an application of subwavelength dielectric gratings for high-sensitivity plasmonic detection

Woo Kyung Jung, Nak-Hyeon Kim, and Kyung Min Byun
Appl. Opt. 51(20) 4722-4729 (2012)