Open AccessSensitivity enhancement through overlapping simultaneously excited Fano resonance modes of metallic-photonic-crystal sensors
Author(s) -
Jian Zhang,
Xinping Zhang,
Xueqiong Su,
Yi Lu,
Shengfei Feng,
Li Wang
Publication year - 2014
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.22.003296
Subject(s) - fano resonance , materials science , photonic crystal , sensitivity (control systems) , optics , photonics , resonance (particle physics) , optoelectronics , plasmon , coupling (piping) , nanophotonics , angle of incidence (optics) , waveguide , physics , particle physics , electronic engineering , engineering , metallurgy
We investigated enhancement of sensitivity of sensors based on metallic photonic crystals through tuning the thickness of the waveguide layer by pulsed laser deposition. Thicker waveguides made of InGaZnO allow double resonance of Fano coupling modes due to plasmonic-photonic interactions. Tuning the angle of incidence enables overlap between these doubly resonant modes, which induces much enlarged and spectrally narrowed sensor signals, leading to significantly enhanced sensitivity of the sensor device. The thickness of the waveguide layer is found to be a crucial structural parameter to improve sensitivity of the MPC sensors.