Perturbation Theory for Plasmonic Modulation and Sensing

Details Perturbation Theory for Plasmonic Modulation and Sensing Perturbation Theory for Plasmonic Modulation and Sensing

2010-09-07

arxiv.org/abs/1009.1339v1

Physics

Optics

17 pages, 6 figures

Scientific paper

10.1103/PhysRevB.83.205131

We develop a general perturbation theory to treat small parameter changes in dispersive plasmonic nanostructures and metamaterials. We specifically apply it to dielectric refractive index, and metallic plasma frequency modulation in metal- dielectric nanostructures. As a numerical demonstration, we verify the theory's accu- racy against direct calculations, for a system of plasmonic rods in air where the metal is defined by a two-pole fit of silver's dielectric function. We also discuss new optical behavior related to plasma frequency modulation in such systems. Our approach provides new physical insight for the design of plasmonic devices for biochemical sensing and optical modulation, and future active metamaterial applications.

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