Issue 29, 2015

A graphene based tunable terahertz sensor with double Fano resonances

Abstract

We propose an ultrasensitive terahertz (THz) sensor consisting of a subwavelength graphene disk and an annular gold ring within a unit cell. The interference between the resonances arising from the graphene disk and the gold ring gives rise to Fano type resonances and enables ultrasensitive sensing. Our full wave electromagnetic simulations show frequency sensitivity as high as 1.9082 THz per refractive index unit (RIU) and a figure of merit (FOM) of 6.5662. Furthermore, the sensing range can be actively tuned by adjusting the Fermi level of graphene.

Graphical abstract: A graphene based tunable terahertz sensor with double Fano resonances

Article information

Article type
Paper
Submitted
09 May 2015
Accepted
20 Jun 2015
First published
24 Jun 2015

Nanoscale, 2015,7, 12682-12688

Author version available

A graphene based tunable terahertz sensor with double Fano resonances

Y. Zhang, T. Li, B. Zeng, H. Zhang, H. Lv, X. Huang, W. Zhang and A. K. Azad, Nanoscale, 2015, 7, 12682 DOI: 10.1039/C5NR03044G

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