Open AccessStudy on the dual-Fano resonance generation and its potential for self-calibrated sensing
Author(s) -
Xiang Zhao,
Zhuo Cheng,
Ming Zhu,
Tianye Huang,
Shuwen Zeng,
Jianxing Pan,
Chaolong Song,
Yuhan Wang,
Perry Ping Shum
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.399952
Subject(s) - fano resonance , figure of merit , refractive index , coupled mode theory , sensitivity (control systems) , optics , surface plasmon resonance , resonance (particle physics) , surface plasmon polariton , coupling (piping) , materials science , plasmon , wavelength , nanosensor , surface plasmon , optoelectronics , physics , nanotechnology , electronic engineering , particle physics , nanoparticle , metallurgy , engineering
Sensors based on Fano resonance (FR) have become a promising platform for various biological and chemical applications. However, most investigations on FR are limited to the generation of individual resonance. In this paper, based on the coupling between surface plasmon polariton (SPP) and two photonic waveguide modes, a dual-FR system is designed and analyzed. To explain the coupling mechanism, an extended temporal coupled-mode model is established to provide the physical insight. The spectral response obtained from the model matches well with the numerical one. Due to the decoupled nature of the FRs, a self-calibrated or dual-parameter sensing scheme for refractive index and temperature is proposed. The refractive index sensitivity up to 765 nm/RIU and temperature sensitivity up to 0.087 nm/°C are obtained by wavelength interrogation with figure-of-merit (FOM) up to 33260.9 RIU -1 and 3.78 °C -1 respectively. The proposed sensor provides great potential in fields of the multi-parameter sensing.