Perturbation theory for plasmonic modulation and sensing
Perturbation theory for plasmonic modulation and sensing
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DOI:
10.1103/physrevb.83.205131
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发表时间:
2011-05-25
影响因子:
3.7
通讯作者:
Fan, Shanhui
中科院分区:
文献类型:
--
作者:
Raman, Aaswath;Fan, Shanhui
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 accuracy against direct calculations for a system of plasmonic rods in air where the metal is defined by a three-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.