title: Plasmon resonances of a gold nanostar.
abstract: Using the finite-difference time-domain method, we show that the plasmons of a nanostar result from hybridization of plasmons of the core and tips of the nanoparticle. The nanostar core serves as a nanoscale antenna, dramatically increasing the excitation cross section and the electromagnetic field enhancements of the tip plasmons. Our analysis demonstrates that the plasmon hybridization picture can be combined with numerical approaches to interpret the physical origin of the plasmons of highly complex nanostructures.
authors.affiliation: Laboratory for Nanophotonics, Department of Physics and Astronomy, M.S. 61, Rice University, Houston, Texas 77005-1892, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Hao
authors.forename: Colleen L
authors.initials: CL
authors.lastname: Nehl
authors.forename: Jason H
authors.initials: JH
authors.lastname: Hafner
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander