title: Unidirectional surface plasmon-polariton excitation by a compact slot partially filled with dielectric.
abstract: We propose a new scheme on unidirectional surface plasmon-polariton (SPP) excitation with the following advantages: ultracompact size, working at arbitrary incidence angle and over a wide spectrum. The proposed structure utilizes a partially filled metallic slot with dielectric to realize unidirectional SPP excitation via direct field manipulation. We theoretically and numerically show that unidirectional SPP excitation with a ratio of 93% can be achieved by a structure with a 50 nm slot. The proposed structure keeps its functional capability over incident angles from -80° to 80°, and has a broadband working spectrum of more than 70 nm.
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Li
authors.forename: Dao Hua
authors.initials: DH
authors.lastname: Zhang
authors.forename: Changchun
authors.initials: C
authors.lastname: Yan
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Yueke
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhengji
authors.initials: Z
authors.lastname: Xu
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Fei
authors.initials: F
authors.lastname: Qin