title: High-Q terahertz Fano resonance with extraordinary transmission in concentric ring apertures.
abstract: We experimentally demonstrate a polarization-independent terahertz Fano resonance with extraordinary transmission when light passes through two concentric subwavelength ring apertures in the metal film. The Fano resonance is enabled by the coupling between a high-Q dark mode and a low-Q bright mode. We find the Q factor of the dark mode ranges from 23 to 40, which is 3~6 times higher than Q of bright mode. We show the Fano resonance can be tuned by varying the geometry and dimension of the structures. We also demonstrate a polarization dependent Fano resonance in a modified structure of concentric ring apertures.
authors.forename: Jie
authors.initials: J
authors.lastname: Shu
authors.forename: Weilu
authors.initials: W
authors.lastname: Gao
authors.forename: Kimberly
authors.initials: K
authors.lastname: Reichel
authors.forename: Daniel
authors.initials: D
authors.lastname: Nickel
authors.forename: Jason
authors.initials: J
authors.lastname: Dominguez
authors.forename: Igal
authors.initials: I
authors.lastname: Brener
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Mittleman
authors.forename: Qianfan
authors.initials: Q
authors.lastname: Xu