title: Controlling the near-field excitation of nano-antennas with phase-change materials.
abstract: By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned. Isolated energy hot-spots at a subwavelength scale can be created and adjusted across the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576 Singapore.
authors.forename: Tsung Sheng
authors.initials: TS
authors.lastname: Kao
authors.forename: Yi Guo
authors.initials: YG
authors.lastname: Chen
authors.forename: Ming Hui
authors.initials: MH
authors.lastname: Hong
keywords: light localization; nano-antenna; near field; phase-change materials; plasmon coupling