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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 5 — May. 5, 2006

Enhanced surface-plasmon resonance absorption in metal–dielectric–metal layered microspheres

Keisuke Hasegawa, Charles Rohde, and Miriam Deutsch  »View Author Affiliations

Optics Letters, Vol. 31, Issue 8, pp. 1136-1138 (2006)

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We present a theoretical study of the dispersion relation of surface-plasmon resonances of mesoscopic metal–dielectric–metal microspheres. By analyzing the solutions to Maxwell’s equations, we obtain a simple geometric condition for which the system exhibits a band of surface-plasmon modes whose resonant frequencies are weakly dependent on the multipole number. Using a modified Mie calculation, we find that a large number of modes belonging to this flat-dispersion band can be excited simultaneously by a plane wave, thus enhancing the absorption cross section. We demonstrate that the enhanced absorption peak of the sphere is geometrically tunable over the entire visible range.

© 2006 Optical Society of America

OCIS Codes
(260.3910) Physical optics : Metal optics
(290.2200) Scattering : Extinction

ToC Category:

Original Manuscript: November 29, 2005
Revised Manuscript: January 18, 2006
Manuscript Accepted: January 20, 2006

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

Keisuke Hasegawa, Charles Rohde, and Miriam Deutsch, "Enhanced surface-plasmon resonance absorption in metal-dielectric-metal layered microspheres," Opt. Lett. 31, 1136-1138 (2006)

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