title: Optically implemented broadband blueshift switch in the terahertz regime.
abstract: We experimentally demonstrate, for the first time, an optically implemented blueshift tunable metamaterial in the terahertz (THz) regime. The design implies two potential resonance states, and the photoconductive semiconductor (silicon) settled in the critical region plays the role of intermediary for switching the resonator from mode 1 to mode 2. The observed tuning range of the fabricated device is as high as 26% (from 0.76 THz to 0.96 THz) through optical control to silicon. The realization of broadband blueshift tunable metamaterial offers opportunities for achieving switchable metamaterials with simultaneous redshift and blueshift tunability and cascade tunable devices. Our experimental approach is compatible with semiconductor technologies and can be used for other applications in the THz regime.
authors.affiliation: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: Nian-Hai
authors.initials: NH
authors.lastname: Shen
authors.forename: Maria
authors.initials: M
authors.lastname: Massaouti
authors.forename: Mutlu
authors.initials: M
authors.lastname: Gokkavas
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Manceau
authors.forename: Ekmel
authors.initials: E
authors.lastname: Ozbay
authors.forename: Maria
authors.initials: M
authors.lastname: Kafesaki
authors.forename: Thomas
authors.initials: T
authors.lastname: Koschny
authors.forename: Stelios
authors.initials: S
authors.lastname: Tzortzakis
authors.forename: Costas M
authors.initials: CM
authors.lastname: Soukoulis