【研究成果】2015年

研究成果88

Gap Plasmon Resonance in a Suspended Plasmonic Nanowire Coupled to a Metallic Substrate
Masashi Miyata, Aaron Holsteen‡, Yusuke Nagasaki, Mark L. Brongersma, and Junichi Takahara
Nano Lett., 2015, 15 (8), pp 5609–5616

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.

Dark-field scattering images of a suspended gold NW illuminated by TM (the right middle)　and TE (bottom) polarized light. The NW shows various scattering colors that range from red to green along the wire- length-axis under TM illumination, whereas the NW shows only a green color under TE illumination.