Controlling the optical spectra of gold nano-islands by changing the aspect ratio and the inter-island distance: theory and experiment |
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Authors: | Y. Fleger M. Rosenbluh Y. M. Strelniker D. J. Bergman A. N. Lagarkov |
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Affiliation: | (1) High Voltage Electron Microscopy Station, National Institute for Materials Science, 3-13, Sakura, Tsukuba 305-0003, Japan;(2) Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan |
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Abstract: | The extinction spectrum of a dielectric film with periodic array of metallic islands of different shapes and different mutual distances was studied both theoretically and experimentally. It is shown, analytically, numerically and experimentally, that the positions of the surface plasmon resonances depend on the nano-structural details. We propose two ways of controlling plasmon resonance frequency: changing the aspect ratio of the elliptical (or rectangular) islands and changing their mutual distances. A new analytical asymptotic approach for calculating the optical properties of such plasmonic systems is developed. The results of our analytical and numerical studies are in good qualitative agreement with experiment. |
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