Optical Design and Engineering

Broadband absorption properties of apodized nanometric gratings

[+] Author Affiliations
Joaquim Junior Isidio de Lima, Vitaly Felix Rodriguez-Esquerre

Federal University of Bahia, Department of Electrical Engineering, Salvador 40210-630, Brazil

Juarez Caetano da Silva

Federal University of Bahia, Department of Electrical Engineering, Salvador 40210-630, Brazil

Federal Institute of Bahia, Department of Electrical-Electronical Technology, Salvador 40301-015, Brazil

Opt. Eng. 54(8), 085103 (Aug 11, 2015). doi:10.1117/1.OE.54.8.085103
History: Received April 22, 2015; Accepted July 16, 2015
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

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


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