Paper NS-TuP3
Localized Surface Plasmons and Hot Spots from the Interstitial Sites in Linear Nano-Hole Array Structures of Gold Revealed by Near-Field Two-Photon Excitation
Tuesday, October 19, 2010, 6:00 pm, Room Southwest Exhibit Hall
| Session: |
Nanometer-Scale Science and Technology Poster Session |
| Presenter: |
S.I. Kim, KAIST, Republic of Korea |
| Authors: |
S.I. Kim, KAIST, Republic of Korea
K. Imura, Institute for Molecular Science, Japan
S. Sehun Kim, KAIST, Republic of Korea
H. Okamoto, Institute for Molecular Science, Japan
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| Correspondent: |
Click to Email |
We analyzed spatial distribution of enhanced optical field at the gap between nano-holes in nano-hole array structures on gold thin film by near-field two-photon excitation imaging. We prepared linear chain-like array structures of circular nano-holes on gold thin film on a glass substrate, based on the method developed by Fischer [1]. A home-made scanning near field microscope [2] was used to observe two-photon excitation images for individual nano-hole array structures. We used a Ti:Sapphire laser (<100fs, 780 nm) to excite two-photon induced luminescence. Polarization dependences of the two-photon images were also measured. In the near-field two-photon excitation images of the nano-hole arrays, we found strong enhanced signal localized at interstitial sites between nano-holes, when the incident polarization is parallel to the chain axis of the array.
References
[1] U. C. Fischer and H. P. Zingsheim., J. Vac. Sci. Technol. 19, 881 (1981).
[2] K. Imura, T. Nagahara, and H. Okamoto, J. Phys. Chem. B 109, 13214 (2005).