Dual-band wide-angle metamaterial perfect absorber based on the combination of localized surface plasmon resonance and Helmholtz resonance

Changlei Zhang,Mingbo Pu,Xiaoyu Wu,Xiangang Luo,Cheng Huang,Zeyu Zhao,Jiakun Song

doi:10.1038/s41598-017-06087-1

Abstract

In this article, a dual-band wide-angle metamaterial perfect absorber is proposed to achieve absorption at the wavelength where laser radar operates. It is composed of gold ring array and a Helmholtz resonance cavity spaced by a Si dielectric layer. Numerical simulation results reveal that the designed absorber displays two absorption peaks at the target wavelength of 10.6 μm and 1.064 μm with the large frequency ratio and near-unity absorptivity under the normal incidence. The wide-angle absorbing property and the polarization-insensitive feature are also demonstrated. Localized surface plasmons resonance and Helmholtz resonance are introduced to analyze and interpret the absorbing mechanism. The designed perfect absorber can be developed for potential applications in infrared stealth field.

Highlights

Metamaterials (MMs) have attracted much attention owing to their unprecedented ability to manipulate electromagnetic (EM) wave
With the predominance of high absorptivity, polarization-insensitive feature and wide-angle absorbing property, this design can be developed for potential applications in infrared EM stealth field
It is composed of a top metallic pattern layer and a resonance cavity spaced by a Si dielectric layer

Summary

Introduction

Metamaterials (MMs) have attracted much attention owing to their unprecedented ability to manipulate electromagnetic (EM) wave. A great number of intriguing applications, such as electromagnetic cloaking[1, 2], super lens[3, 4], low-RCS materials[5,6,7], polarization convertor[8, 9], and perfect absorber[10,11,12], have benefited from advances in metamaterial technology Among these applications, the MMs absorbers are much significant in stealth field. To keep invisibility in front of the laser radar, the corresponding dual-band absorber is necessary, but the frequency ratio of the above two central points is too large (~10) for the wide-band absorber to simultaneously cover these two target points. The objective of this paper is to achieve perfect absorption at the two operation wavelengths of the laser radar with such a large frequency ratio. With the predominance of high absorptivity, polarization-insensitive feature and wide-angle absorbing property, this design can be developed for potential applications in infrared EM stealth field

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Conclusion