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Optical Engineering

Broadband absorption properties of apodized nanometric gratings
Author(s): Joaquim Junior Isidio de Lima; Juarez Caetano da Silva; Vitaly Felix Rodriguez-Esquerre
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Paper 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.

Paper Details

Date Published: 11 August 2015
PDF: 5 pages
Opt. Eng. 54(8) 085103 doi: 10.1117/1.OE.54.8.085103
Published in: Optical Engineering Volume 54, Issue 8
Show Author Affiliations
Joaquim Junior Isidio de Lima, Univ. Federal da Bahia (Brazil)
Juarez Caetano da Silva, Univ. Federal da Bahia (Brazil)
Federal Institute of Bahia (Brazil)
Vitaly Felix Rodriguez-Esquerre, Univ. Federal da Bahia (Brazil)

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