Ultra-narrowband dielectric metamaterial absorber with ultra-sparse nanowire grids for sensing applications

Yan-Lin Liao,Yan Zhao

doi:10.1038/s41598-020-58456-y

Yan-Lin Liao, Yan Zhao

Open Access

https://doi.org/10.1038/s41598-020-58456-y

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Journal: Scientific Reports	Publication Date: Jan 30, 2020
Citations: 47	License type: open-access

Affiliation: Anhui University, Anhui Medical University

Abstract

Due to their low losses, dielectric metamaterials provide an ideal resolution to construct ultra-narrowband absorbers. To improve the sensing performance, we present numerically a near-infrared ultra-narrowband absorber by putting ultra-sparse dielectric nanowire grids on metal substrate in this paper. The simulation results show that the absorber has an absorption rate larger than 0.99 with full width at half-maximum (FWHM) of 0.38 nm. The simulation field distribution also indicates that the ultra-narrowband absorption is originated from the low loss in the guided-mode resonance. Thanks to the ultra-narrow absorption bandwidths and the electric field mainly distributed out of the ultra-sparse dielectric nanowire grids, our absorber has a high sensitivity S of 1052 nm/RIU and a large figure of merit (FOM) of 2768 which mean that this ultra-narrowband absorber can be applied as a high-performance refractive index sensor.

Highlights

Due to their low losses, dielectric metamaterials provide an ideal resolution to construct ultranarrowband absorbers
It has been found that dielectric metamaterials (DMs) composed of dielectric microstructures can be used to manipulate electromagnetic resonance[27,28,29,30,31,32]
Due to the unique advantage of the low loss, dielectric metamaterials provide an ideal resolution for narrowing the absorption bandwidth[33,34,35]

Summary

Introduction

Due to their low losses, dielectric metamaterials provide an ideal resolution to construct ultranarrowband absorbers. Thanks to the ultra-narrow absorption bandwidths and the electric field mainly distributed out of the ultra-sparse dielectric nanowire grids, our absorber has a high sensitivity S of 1052 nm/RIU and a large figure of merit (FOM) of 2768 which mean that this ultra-narrowband absorber can be applied as a high-performance refractive index sensor. The absorbers with narrower absorption bandwidth have better performance in the applications of thermal emitters and sensors[8,21]. Some ultra-narrowband absorbers have been proposed by manipulating electromagnetic resonance in metallic microstructures[22,23,24,25,26]. On the other ( ) hand, it is well known that the sensing performance of an absorber can be evaluated by sensitivity

Methods

Results

Conclusion