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10 September 2008 Tailoring coupling of light to local plasmons by using Ag nanorods/dielectric layer/mirror sandwich structures
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Abstract
The optical properties of the sandwich structures of Ag nanorod array (NRA)/dielectric layer/Ag mirror have been investigated theoretically and experimentally. 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 nanostrutured sandwiches.
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Motofumi Suzuki, Yoshikatsu Imai, Hiroki Tokunaga, Kaoru Nakajima, Kenji Kimura, Takao Fukuoka, and Yasushige Mori "Tailoring coupling of light to local plasmons by using Ag nanorods/dielectric layer/mirror sandwich structures", Proc. SPIE 7041, Nanostructured Thin Films, 70410B (10 September 2008); https://doi.org/10.1117/12.792750
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