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Journal of Nanophotonics

Tailoring coupling of light to local plasmons by using Ag nanorods/structured dielectric/mirror sandwiches
Author(s): Motofumi Suzuki; Yoshikatsu Imai; Hiroki Tokunaga; Kaoru Nakajima; Kenji Kimura; Takao Fukuoka; Yasushige Mori
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Paper Abstract

The optical properties of the sandwich of Ag nanorod array (NRA)/structured dielectric layer/Ag mirror have been investigated theoretically and experimentally, where the structured dielectric layer has stacked sublayers of an anisotropic nanocolumnar layer and a uniform layer. The functions of the nanocolumnar and the uniform sublayers are to control shape of the Ag nanorods and to tune optical path length inside the sandwich, respectively. Calculations based on a simple model by treating the NRAs as uniform effective media indicate that the antireflection condition is realized by changing the thickness of the dielectric layer and that the Ag nanorods absorb most of the incident light. The designed structures have been successfully fabricated by taking advantages of the dynamic oblique-angle deposition technique. Under the experimental antireflection condition, Raman scattering measured on the Ag NRA in the near infrared region exhibits significant enhancement. This indicates that the local electric field close to the Ag nanorods can be controlled by the interference of light in the nanostructured sandwiches.

Paper Details

Date Published: 1 January 2009
PDF: 12 pages
J. Nanophoton. 3(1) 031502 doi: 10.1117/1.3079804
Published in: Journal of Nanophotonics Volume 3, Issue 1
Show Author Affiliations
Motofumi Suzuki, Kyoto Univ. (Japan)
Yoshikatsu Imai, Kyoto Univ. (Japan)
Hiroki Tokunaga
Kaoru Nakajima, Kyoto Univ. (Japan)
Kenji Kimura, Kyoto Univ. (Japan)
Takao Fukuoka
Yasushige Mori, Doshisha Univ. (Japan)

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