Broadband absorption properties of apodized nanometric gratings

Joaquim Junior Isidio de Lima; Juarez Caetano da Silva; Vitaly Felix Rodriguez-Esquerre

doi:10.1117/1.OE.54.8.085103

11 August 2015 Broadband absorption properties of apodized nanometric gratings

Joaquim Junior Isidio de Lima, Juarez Caetano da Silva, Vitaly Felix Rodriguez-Esquerre

Author Affiliations +

Optical Engineering, Vol. 54, Issue 8, 085103 (August 2015). https://doi.org/10.1117/1.OE.54.8.085103

Abstract

We propose a strategy to design broadband absorbers. It is based on the apodization of a supercell composed of an array of subwavelength metallic-insulator gratings. The proposed absorber consists of grooves with variable depths in a metallic substrate filled with a dielectric material. It was demonstrated that the apodization procedure plays an important role in the required broadband operation of the proposed absorbers. The proposed absorber presented averaged values of absorption of the order of 94% for wavelengths from 700 to 2300 nm. The spectral response of the absorption coefficient, for a plane wave under normal incidence, has been calculated by using an efficient frequency-domain finite-element method.

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Joaquim Junior Isidio de Lima, Juarez Caetano da Silva, and Vitaly Felix Rodriguez-Esquerre "Broadband absorption properties of apodized nanometric gratings," Optical Engineering 54(8), 085103 (11 August 2015). https://doi.org/10.1117/1.OE.54.8.085103

Published: 11 August 2015

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KEYWORDS

Absorption

Apodization

Dielectric polarization

Silica

Dielectrics

Polymers

Metals

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