title: A plasmonic Fano switch.
abstract: Plasmonic clusters can support Fano resonances, where the line shape characteristics are controlled by cluster geometry. Here we show that clusters with a hemicircular central disk surrounded by a circular ring of closely spaced, coupled nanodisks yield Fano-like and non-Fano-like spectra for orthogonal incident polarization orientations. When this structure is incorporated into an uniquely broadband, liquid crystal device geometry, the entire Fano resonance spectrum can be switched on and off in a voltage-dependent manner. A reversible transition between the Fano-like and non-Fano-like spectra is induced by relatively low (∼6 V) applied voltages, resulting in a complete on/off switching of the transparency window.
authors.affiliation: Department of Chemistry, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States.
authors.forename: Wei-Shun
authors.initials: WS
authors.lastname: Chang
authors.forename: J Britt
authors.initials: JB
authors.lastname: Lassiter
authors.forename: Pattanawit
authors.initials: P
authors.lastname: Swanglap
authors.forename: Heidar
authors.initials: H
authors.lastname: Sobhani
authors.forename: Saumyakanti
authors.initials: S
authors.lastname: Khatua
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
authors.forename: Stephan
authors.initials: S
authors.lastname: Link
mesh_terms: D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D010316:Particle Size; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*