Special Section on Nanostructures Honoring Craig F. Bohren

Symmetric and antisymmetric resonances in a pair of metal-dielectric nanoshells: tunability and closed-form formulas

[+] Author Affiliations
Andrea Vallecchi, Salvatore Campione, Filippo Capolino

University of California, Irvine, Department of Electrical Engineering and Computer Science, Engineering Hall 4422, Irvine, CA 92697

J. Nanophoton. 4(1), 041577 (April 27, 2010). doi:10.1117/1.3430112
History: Received January 11, 2010; Revised April 6, 2010; Accepted April 7, 2010; April 27, 2010; Online April 27, 2010
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Abstract

Resonances of symmetric and antisymmetric polarization states in tightly coupled nanoshell particles made of either a metallic core and a dielectric shell or, vice versa, a dielectric core and a metallic shell were analyzed at optical frequencies. The investigation was performed by using the single dipole approximation (SDA) with all the dynamical retarded field terms included. Furthermore, analytic formulas for the four possible resonances were derived for the first time by retaining only the static (non-retarded) term in the dipolar field expression. The image principle was used to distinguish a priori between symmetric and antisymmetric modes and for full-wave simulations performed to confirm the identification of resonances achieved by the SDA. It was observed that the resonance frequencies of a pair of nanoshells can be tuned over a wide range of wavelength/frequencies by varying the relative dimensions of the core and shell. This makes this kind of particle pairs suited very well to be adopted either as constituents of metamaterials or to enhance local fields when operating frequencies range from the visible to the infrared spectral regions.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Andrea Vallecchi ; Salvatore Campione and Filippo Capolino
"Symmetric and antisymmetric resonances in a pair of metal-dielectric nanoshells: tunability and closed-form formulas", J. Nanophoton. 4(1), 041577 (April 27, 2010). ; http://dx.doi.org/10.1117/1.3430112


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