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Issue 33, 2018
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Graphene-based dual-band independently tunable infrared absorber

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Abstract

In this paper, we theoretically demonstrate a dual-band independently tunable absorber consisting of a stacked graphene nanodisk and graphene layer with nanohole structure, and a metal reflector spaced by insulator layers. This structure exhibits a dipole resonance mode in graphene nanodisks and a quadrupole resonance mode in the graphene layer with nanoholes, which results in the enhancement of absorption over a wide range of incident angles for both TE and TM polarizations. The peak absorption wavelength is analyzed in detail for different geometrical parameters and the Fermi energy levels of graphene. The results show that both peaks of the absorber can be tuned dynamically and simultaneously by varying the Fermi energy level of graphene nanodisks and graphene layer with nanoholes structure. In addition, one can also independently tune each resonant frequency by only changing the Fermi energy level of one graphene layer. Such a device could be used as a chemical sensor, detector or multi-band absorber.

Graphical abstract: Graphene-based dual-band independently tunable infrared absorber

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Article information


Submitted
28 Mar 2018
Accepted
31 Jul 2018
First published
01 Aug 2018

Nanoscale, 2018,10, 15564-15570
Article type
Paper
Author version available

Graphene-based dual-band independently tunable infrared absorber

P. Sun, C. You, A. Mahigir, T. Liu, F. Xia, W. Kong, G. Veronis, J. P. Dowling, L. Dong and M. Yun, Nanoscale, 2018, 10, 15564 DOI: 10.1039/C8NR02525H

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