Wavelength-Selective Near Unity Absorber Based on Fabry-Pérot Nanoresonators

I L Gomes De Souza,V F Rodriguez-Esquerre

doi:10.1590/2179-10742021v20i21161

I L Gomes De Souza, V F Rodriguez-Esquerre

Open Access

https://doi.org/10.1590/2179-10742021v20i21161

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Abstract

We proposed and analyzed a planar narrow-band absorber based on a bi-layer metal/dielectric structure. The planar absorber uses the Fabry-Pérot resonance and the inherent loss of the metals, for maximum light absorption in the range of the electromagnetic spectrum visible to the near infrared. The absorption resonance peak can be shifted to other regions of the spectrum by varying the dielectric film thicknesses. It is also possible to control the absorption with the angle of incidence for TE and TM polarization modes. The high absorption (near unity) and the high tolerance to fabrication errors of the proposed absorber can be explored in a large number of optoelectronic devices.

Highlights

Absorbers based on metamaterials (MMs) have attracted lot of interest in the last decades due to the vast amount of applications in photodetection, image generation, thermal emission, sensors and shielding [1]
Perfect absorbers (PAs) based devices are widely studied in engineering as they have great potential for practical applications and have attracted a lot of attention due to their excellent ability to harvest electromagnetic energy
In [9], a PA for multiple band light absorption in the region of the visible and ultraviolet was proposed and demonstrated, the absorption is obtained by optical resonances supported by the high index dielectric cavity with values of 98.9% for multiple resonance peaks

Summary

INTRODUCTION

Absorbers based on metamaterials (MMs) have attracted lot of interest in the last decades due to the vast amount of applications in photodetection, image generation, thermal emission, sensors and shielding [1]. We analyzed the behavior of the structure with the variation of the dielectric thickness, investigated the physical mechanism of coupling of the electromagnetic field in the resonant cavity and the dependence of the resonance with the angle of incidence for transverse electric (TE) and transverse magnetic (TM) polarizations. This kind of resonators are being extensively studied for absorption [6], [7], [15] and transmission [13], [16] of light in the visible spectrum and in Infrared (IR) [4], [5],[12]. The metallic layers in the planar nanoresonators are considered to extend to the semi-infinite

ABSORBER DESIGN AND METHODOLOGY

NUMERICAL RESULTS AND DISCUSSION

CONCLUSION