title: 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.
authors.affiliation: Qingdao Key Laboratory of Terahertz Technology, College of Electronic Communication and Physics, Shandong University of Science and Technology, Qingdao 266510, China.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Zhang
authors.forename: Tongtong
authors.initials: T
authors.lastname: Li
authors.forename: Beibei
authors.initials: B
authors.lastname: Zeng
authors.forename: Huiyun
authors.initials: H
authors.lastname: Zhang
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Lv
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Huang
authors.forename: Weili
authors.initials: W
authors.lastname: Zhang
authors.forename: Abul K
authors.initials: AK
authors.lastname: Azad