Special Section on Nanostructured Thin Films

Tailoring coupling of light to local plasmons by using Ag nanorods/structured dielectric/mirror sandwiches

[+] Author Affiliations
Motofumi Suzuki, Yoshikatsu Imai, Hiroki Tokunaga, Kaoru Nakajima, Kenji Kimura

Department of Micro Engineering, Kyoto University, Yoshida, Sakyo, Kyoto, Kyoto 606-8501 Japan

Takao Fukuoka

JST Kyoto Pref. CREATE, Seika, Kyoto 619-0237 Japan

Yasushige Mori

Department of Chemical Engineering and Materials Science, Doshisha University, Kyotanabe, Kyoto 610-0394 Japan

J. Nanophoton. 3(1), 031502 (January 21, 2009). doi:10.1117/1.3079804
History: Received October 2, 2008; Revised December 2, 2008; Accepted December 3, 2008; January 21, 2009; Online January 21, 2009
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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.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Motofumi Suzuki ; Yoshikatsu Imai ; Hiroki Tokunaga ; Kaoru Nakajima ; Kenji Kimura, et al.
"Tailoring coupling of light to local plasmons by using Ag nanorods/structured dielectric/mirror sandwiches", J. Nanophoton. 3(1), 031502 (January 21, 2009). ; http://dx.doi.org/10.1117/1.3079804


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