All-Dielectric Dual-Band Metamaterial Absorber Based on Ring Nanocavity in Visible Region for Sensing Applications
Fei Liu,
Meiling Zou,
Zhenjie Feng,
Bo Ni,
Baisong Ye,
Yunji Wang
Affiliations
Fei Liu
School of Electronics and Information Engineering, Jinling Institute of Technology, Nanjing 211169, China
Meiling Zou
College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
Zhenjie Feng
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science and Technology, Nanjing 210044, China
Bo Ni
Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science and Technology, Nanjing 210044, China
Baisong Ye
School of Intelligent Control, Changzhou Institute of Industry Technology, Changzhou 213164, China
Yunji Wang
School of Electronics and Information Engineering, Jinling Institute of Technology, Nanjing 211169, China
In this study, an all-dielectric metamaterial absorber consisting of a ring nanocavity array, a spacer layer, and a metallic substrate is designed and investigated. The simulation results show that the two perfect absorption peaks (99.91% and 99.96%) are achieved at 539 nm and 673 nm. The two resonance modes caused by the different electric and magnetic field distributions of the ring nanocavity structure lead to different absorption and sensing properties. In addition, the influence of the structural parameters, such as the width of the nanocavity, on the sensing characteristics was studied and is presented here. A high sensitivity and narrow band result in a huge figure of merit when the proposed absorber is operated as a refractive index sensor.
