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Proceedings Paper

Nanostructure processing by near-field with femtosecond laser excitation: process switching and SERS application
Author(s): Minoru Obara; Tatsunori Sakano; Tetsuo Sakai; Henry Nugroho; Tomoya Miyanishi; Yuto Tanaka; Toshiharu Saiki; Nikolay N. Nedyalkov; Petar A. Atanasov
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Paper Abstract

This paper describes two topics. (1): Nano-processing by near-field optics can fabricate nano-scale structures even with near-infrared 800 nmTi:saphire laser. New phenomena using particles, leading to a new nano-processing technique via plasmonics, even with the use of dielectric particles is reported. The physics of nano-hole fabrication process is switchable simply by the laser fluence. (2): ZnO nanorod arrays on Si (100) substrate were grown by pulsed laser deposition (PLD) method, and then coated with Au. Two samples of Au-coated nanorod arrays with different average diameters of 150 nm and 400 nm were prepared to investigate the size dependence of the surface enhanced Raman scattering (SERS). The diameter of the nanorods was well controllable by the substrate position during PLD. High SERS enhancement was observed from both Au-coated ZnO nanorod arrays. The Raman spectra of Rhodamine 6G (R6G) as low as 1 nM were measured with average diameter of 400 nm at an excitation wavelength of 532 nm.

Paper Details

Date Published: 19 December 2008
PDF: 10 pages
Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 702703 (19 December 2008); doi: 10.1117/12.822436
Show Author Affiliations
Minoru Obara, Keio Univ. (Japan)
Tatsunori Sakano, Keio Univ. (Japan)
Tetsuo Sakai, Keio Univ. (Japan)
Henry Nugroho, Keio Univ. (Japan)
Tomoya Miyanishi, Keio Univ. (Japan)
Yuto Tanaka, Keio Univ. (Japan)
Toshiharu Saiki, Keio Univ. (Japan)
Nikolay N. Nedyalkov, Keio Univ. (Japan)
Institute of Electronics (Bulgaria)
Petar A. Atanasov, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 7027:
15th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Elena Taskova; Ekaterina Borisova; Alexander Serafetinides, Editor(s)

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