title: Fano resonance in concentric ring apertures.
abstract: We demonstrate a polarization-independent mid-infrared Fano resonance with extraordinary transmission when light passes through two concentric metallic ring apertures. A high-Q dark mode is indirectly excitated by coupling with a low-Q bright mode. A coupled optical resonator model is used to analyze the coupling process between the bright and dark modes. We find the Q of the dark mode is 3~6 times higher than that of the bright mode. We show that the dark mode can be selectively disabled without affecting the bright mode.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Shu
authors.forename: Weilu
authors.initials: W
authors.lastname: Gao
authors.forename: Qianfan
authors.initials: Q
authors.lastname: Xu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*