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
Electric Field Enhancement of Nano Gap of Silver Prisms
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
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.
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.
KENZO Yamaguchi;TOMOHIRO Inoue;MASAMITSU Fujii;MASANOBU Haraguchi; TOSHIHIRO Okamoto;MASUO Fukui;SHU Seki;SEIICHI Tagawa. Electric Field Enhancement of Nano Gap of Silver Prisms[J]. 中国物理快报, 2007, 24(10): 2934-2937.
KENZO Yamaguchi, TOMOHIRO Inoue, MASAMITSU Fujii, MASANOBU Haraguchi, TOSHIHIRO Okamoto, MASUO Fukui, SHU Seki, SEIICHI Tagawa. Electric Field Enhancement of Nano Gap of Silver Prisms. Chin. Phys. Lett., 2007, 24(10): 2934-2937.
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