title: Standing wave plasmon modes interact in an antenna-coupled nanowire.
abstract: In a standing wave optical cavity, the coupling of cavity modes, for example, through a nonlinear medium, results in a rich variety of nonlinear dynamical phenomena, such as frequency pushing and pulling, mode-locking and pulsing, modal instabilities, even complex chaotic behavior. Metallic nanowires of finite length support a hierarchy of longitudinal surface plasmon modes with standing wave properties: the plasmonic analog of a Fabry-Pérot cavity. Here we show that positioning the nanowire within the gap of a plasmonic nanoantenna introduces a passive, hybridization-based coupling of the standing-wave nanowire plasmon modes with the antenna structure, mediating an interaction between the nanowire plasmon modes themselves. Frequency pushing and pulling, and the enhancement and suppression of specific plasmon modes, can be controlled and manipulated by nanoantenna position and shape.
authors.affiliation: Department of Electrical and Computer Engineering, ‡Department of Physics, §Department of Chemistry, ∥Laboratory for Nanophotonics, and the Rice Quantum Institute, Rice University , MS-378, 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Jared K
authors.initials: JK
authors.lastname: Day
authors.forename: Nicolas
authors.initials: N
authors.lastname: Large
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
keywords: Fabry-Pérot; Plasmonic nanoantenna; antinode drift; cathodoluminescence; dark-field spectroscopy; frequency pulling; plasmon hybridization