title: Plasmon-induced transparency in asymmetric T-shape single slit.
abstract: By utilizing a dielectric-film-coated asymmetric T-shape single slit, comprising two grooves of slightly detuned widths immediately contacting with a single nanoslit, the plasmon-induced transparency was experimentally demonstrated. Because of the symmetry breaking in the unit-cell structure, the scattered lights from the two grooves with slightly detuned widths interfere destructively, leading to the plasmon-induced transparency. As a result, a response spectrum with nearly the same interference contrast but a much narrower bandwidth emerges in the unit-cell structure with the footprint of only about 0.9 μm(2), compared with that in the symmetric T-shape single slit. These pronounced features in the structure, such as the increased quality factor, ultracompact size, easy fabrication, and experimental observation, have significant applications in ultracompact plasmonic devices.
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China. chernmore@pku.edu.cn
authors.forename: Jianjun
authors.initials: J
authors.lastname: Chen
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.forename: Song
authors.initials: S
authors.lastname: Yue
authors.forename: Jinghua
authors.initials: J
authors.lastname: Xiao
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong