Open AccessEnhanced optical sensing performance in stacked resonant compound gratings
Author(s) -
Yining Bao,
Xiuhong Liu,
Jinhua Hu,
Jun Zou,
Haiyan Han,
Chao Wang
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.435653
Subject(s) - grating , figure of merit , optics , coupled mode theory , materials science , finite element method , sensitivity (control systems) , transmission (telecommunications) , eigenmode expansion , diffraction grating , normal mode , refractive index , optoelectronics , physics , acoustics , electronic engineering , vibration , telecommunications , computer science , thermodynamics , engineering
We proposed a high-performance integrated optical sensor based on a stacked resonant compound grating (SRCG). The transmission spectrum of a SRCG is investigated by the theoretical model that combines the coupled mode theory with the eigenmode information of the grating structures. It is found that the spectral width of the SRCG is controlled by changing its structural parameters such as the strip depth, the period of the grating, and cavity length. The simulation results, which are verified by finite element method (FEM), show that the sensitivity of the sensor is 401.8 nm/RIU with its figure of merit (FOM) as high as 57404. The presented sensor is a promising application for high-performance biosensing.