title: Gap Plasmon Resonance in a Suspended Plasmonic Nanowire Coupled to a Metallic Substrate.
abstract: We present an experimental demonstration of nanoscale gap plasmon resonators that consist of an individual suspended plasmonic nanowire (NW) over a metallic substrate. Our study demonstrates that the NW supports strong gap plasmon resonances of various gap sizes including single-nanometer-scale gaps. The obtained resonance features agree well with intuitive resonance models for near- and far-field regimes. We also illustrate that our suspended NW geometry is capable of constructing plasmonic coupled systems dominated by quasi-electrostatics.
authors.affiliation: †Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyata
authors.affiliation: ‡Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States.
authors.forename: Aaron
authors.initials: A
authors.lastname: Holsteen
authors.affiliation: †Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nagasaki
authors.affiliation: ‡Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States.
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brongersma
authors.affiliation: †Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.|§Photonics Advanced Research Center, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Takahara
keywords: Fabry−Perot resonance; Fano resonance; gap plasmon; nanowire; optical antenna; pick-and-place method