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24 February 2006 Plasmon-enhanced absorption and transmission in spherical Bragg resonators
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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.
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Miriam Deutsch, Keisuke Hasegawa, and Charles Rohde "Plasmon-enhanced absorption and transmission in spherical Bragg resonators", Proc. SPIE 6123, Integrated Optics: Devices, Materials, and Technologies X, 612307 (24 February 2006);

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