Ultra-wideband graphene-based absorber in the terahertz regime based on elliptical slots and a complementary sinusoidal-patterned dielectric layer

A graphene-based absorber is presented based on elliptical slots and a complementary sinusoidal-patterned dielectric layer. The proposed absorber structure includes upper dielectric and metal film layers resulting in a Fabry–Perot cavity. The produced cavity enhances the confinement of electromagnet...

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Veröffentlicht in:	Applied optics (2004) 2021-08, Vol.60 (24), p.7297-7303
Hauptverfasser:	Zareian-Jahromi, Ehsan, Nourbakhsh, Milad, Basiri, Raheleh, Mashayekhi, Valiollah
Format:	Artikel
Sprache:	eng
Schlagworte:	Absorbers Bandwidths Dielectrics Electromagnetic radiation Fabry-Perot interferometers Graphene Sine waves Ultrawideband
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container_end_page	7303
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container_title	Applied optics (2004)
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creator	Zareian-Jahromi, Ehsan Nourbakhsh, Milad Basiri, Raheleh Mashayekhi, Valiollah
description	A graphene-based absorber is presented based on elliptical slots and a complementary sinusoidal-patterned dielectric layer. The proposed absorber structure includes upper dielectric and metal film layers resulting in a Fabry–Perot cavity. The produced cavity enhances the confinement of electromagnetic waves. The presented absorber yields an absolute bandwidth of 4.02 THz (0.51–4.53 THz) considering an 0.88 absorbance level together with normal incidence. The presented structure benefits from an almost insensitive ultra-wideband absorbing performance as θ varies up to 50°and 60° for TE and TM polarizations, respectively. Moreover, the considered symmetry in the design procedure results in an almost insensitive structure with respect to the φ incident angle. Finally, the obtained 160% fractional bandwidth is much greater compared to mentioned previous works in literature.
doi_str_mv	10.1364/AO.431075
format	Article
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source	Alma/SFX Local Collection; Optica Publishing Group Journals
subjects	Absorbers Bandwidths Dielectrics Electromagnetic radiation Fabry-Perot interferometers Graphene Sine waves Ultrawideband
title	Ultra-wideband graphene-based absorber in the terahertz regime based on elliptical slots and a complementary sinusoidal-patterned dielectric layer
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