Journal
NANOSCALE
Volume 7, Issue 29, Pages 12682-12688Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr03044g
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC52-06NA25396]
- Natural Science Foundation of Shandong Province, China [ZR2012FM011]
- Qingdao city innovative leading talent plan [13-CX-25]
- CAEP THz Science and Technology Foundation [201401]
- Qingdao Economic & Technical Development Zone Science & Technology Project [2013-1-64]
- Shandong University of Science and Technology Foundation, China [YC140108]
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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.
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