title: Transparency window for the absorptive dipole resonance in a symmetry-reduced grating structure.
abstract: We demonstrate that a transparency window can be obtained within the absorptive dipole resonant regime, by slightly reducing the symmetric arrangement of a dipole-like bar grating covered by a waveguiding layer. The physical understanding is that, under the condition of reducing the grating symmetry, the lossy dipole plasmon resonance can be completely transferred into the waveguide mode in a way of destructive interference. In accompany with the tunable transparency window modulated by the symmetry-reduced displacement, an ultra high group index (slowing down the light) as well as a vortex distribution of the electromagnetic field is found.
authors.affiliation: Physics Department, Southeast University, Nanjing 211189, China. zgdong@seu.edu.cn
authors.forename: Zheng-Gao
authors.initials: ZG
authors.lastname: Dong
authors.forename: Pei-Gen
authors.initials: PG
authors.lastname: Ni
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
authors.forename: X
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000042:Absorption; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*