Tunable Localization and Oscillation of Coupled Plasmon Waves in Graded Plasmonic Chains

Details Tunable Localization and Oscillation of Coupled Plasmon Waves in Graded Plasmonic Chains Tunable Localization and Oscillation of Coupled Plasmon Waves in Graded Plasmonic Chains

2009-11-08

arxiv.org/abs/0911.1487v1

J. Appl. Phys. 106, 113307 (2009)

Physics

Condensed Matter

Materials Science

Sumitted to Journal of Applied Physics

Scientific paper

10.1063/1.3268459

The localization (confinement) of coupled plasmon modes, named as gradons, has been studied in metal nanoparticle chains immersed in a graded dielectric host. We exploited the time evolution of various initial wavepackets formed by the linear combination of the coupled modes. We found an important interplay between the localization of plasmonic gradons and the oscillation in such graded plasmonic chains. Unlike in optical superlattices, gradient cannot always lead to Bloch oscillations, which can only occur for wavepackets consisting of particular types of gradons. Moreover, the wavepackets will undergo different forms of oscillations. The correspondence can be applied to design a variety of optical devices by steering among various oscillations.

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