| Original Articles |
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Electric Field Enhancement of Nano Gap of Silver Prisms |
| KENZO Yamaguchi1;TOMOHIRO Inoue1;MASAMITSU Fujii2;MASANOBU Haraguchi1; TOSHIHIRO Okamoto1;MASUO Fukui1;SHU Seki3;SEIICHI Tagawa3 |
| 1Department of Optical Science and Engineering, Faculty and School of Engineering, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima-city, Tokushima 770-8506, Japan2Department of Electronics and Mechanics, Toba National College of Maritime Technology, 1-1 Ikegami-cho, Toba-city, Mie 517-8501, Japan3Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan |
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| Cite this article: |
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KENZO Yamaguchi, TOMOHIRO Inoue, MASAMITSU Fujii et al 2007 Chin. Phys. Lett. 24 2934-2937 |
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Abstract Using numerical calculation, we examine the effects of gap distance of a pair of nano gap silver prisms with rounded corners on the local light intensity enhancement. Two peaks due to localized surface plasmon (LSP) excitation are observed in a wavelength range from 900nm to 300nm. The results demonstrate that peaks at a longer and a shorter wavelength corresponded to dipole-like and quadrupole-like LSP resonances, respectively. It is found that a gap distance up to 20nm provides larger light intensity enhancement than that of a single silver nano prism with rounded corners. Furthermore, nano gap silver prisms are fabricated by direct focused ion beam processing, and we measure the scattering light spectrum of a pair of nano prisms by a
confocal optical system. However, the two LSP peaks are not observed in
visible range because the sizes of the nano gap and prisms are too large.
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| Keywords:
73.20.Mf
63.20.Pw
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Received: 13 June 2007
Published: 20 September 2007
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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63.20.Pw
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(Localized modes)
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