Focused Excitation of Surface Plasmon Polaritons Based on Gap-Mode in Tip-Enhanced Spectroscopy
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概要
- 論文の詳細を見る
We propose a novel method to improve field enhancement factor in tip-enhanced spectroscopy techniques using gap mode configuration. In gap-mode, a silver coated tip is placed just above the focus at silver thin film deposited on a dielectric substrate. The enormous electric field enhancement generated at the focus is due to coupling of surface plasmon polaritons at the gap between the 48 nm silver film and silver coated tip. The proposed technique was demonstrated in both radially polarized and linearly polarized beam. Radial polarization was found to be better than linear polarization in gap mode because only p-polarized component can contribute to the excitation of surface plasmon of the silver film. The electric field distributions at the gap below tip are calculated using finite difference time domain method and experimentally visualized by scanning probe microscope. Numerical results are in good agreement with the empirical data.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-12-15
著者
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Kawata Satoshi
Nanophotonics Lab. Riken (the Institute Of Physical And Chemical Research)
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Tarun Alvarado
Nanophotonics Lab. Riken (the Institute Of Physical And Chemical Research)
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Taguchi Atsushi
Nanophotonics Lab. Riken (the Institute Of Physical And Chemical Research)
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Hayazawa Norihiko
Nanophotonics Lab. Riken (the Institute Of Physical And Chemical Research)
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Ishitobi Hidekazu
Nanophotonics Lab. Riken (the Institute Of Physical And Chemical Research)
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Ishitobi Hidekazu
Nanophotonics laboratory, RIKEN, Wako, Saitama 351-0198, Japan
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Ikeda Katsuyoshi
Nanophotonics laboratory, RIKEN, Wako, Saitama 351-0198, Japan
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Kawata Satoshi
Nanophotonics laboratory, RIKEN, Wako, Saitama 351-0198, Japan
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