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Proceedings Paper

Plasmon-enhanced absorption and transmission in spherical Bragg resonators
Author(s): Miriam Deutsch; Keisuke Hasegawa; Charles Rohde
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Paper Abstract

We present a theoretical study of the dispersion relation of surface plasmon resonances of mesoscopic metal-dielectric-metal microspheres. These are spherically symmetric Bragg resonators comprising thin, alternating layers of dielectric and metal shells around spherical metal cores. 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 investigate the effect of this flat-dispersion band on the absorption and scattering cross-sections of the layered particle. We find that a large number of modes belonging to this band can be excited simultaneously by a plane wave, thus enhancing the absorption cross-section. Moreover, we observe a narrow transmission resonance due to the metallodielectric shells behaving as a transparent coating in a narrow spectral range. We demonstrate that the enhanced absorption and transmission of the sphere are geometrically tunable over the entire visible range.

Paper Details

Date Published: 24 February 2006
PDF: 8 pages
Proc. SPIE 6123, Integrated Optics: Devices, Materials, and Technologies X, 612307 (24 February 2006); doi: 10.1117/12.646857
Show Author Affiliations
Miriam Deutsch, Univ. of Oregon (United States)
Keisuke Hasegawa, Univ. of Oregon (United States)
Charles Rohde, Univ. of Oregon (United States)

Published in SPIE Proceedings Vol. 6123:
Integrated Optics: Devices, Materials, and Technologies X
Yakov Sidorin; Christoph A. Waechter, Editor(s)

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