A graphene based tunable terahertz sensor with double Fano resonances

2015258 citationsJournal Articlegreen Open Access

Authors

Yuping Zhang · Shandong University of Science and Technology

Tongtong Li · Qingdao Center of Resource Chemistry and New Materials

Beibei Zeng · Los Alamos National Laboratory

Huiyun Zhang · Qingdao Center of Resource Chemistry and New Materials

Huanhuan Lv · Shandong University of Science and Technology

Xiaoyan Huang · Qingdao Center of Resource Chemistry and New Materials

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.

Topics & Keywords

Plasmonic and Surface Plasmon Research Photonic Crystals and Applications Photonic and Optical Devices

Publication Details

Published in: Nanoscale

Volume 7, Issue 29, pp. 12682-12688

DOI: 10.1039/c5nr03044g

Field-Weighted Citation Impact: 12.34

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A graphene based tunable terahertz sensor with double Fano resonances

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Abstract

Topics & Keywords

Publication Details