Plasmonic near-field enhanced absorption and scattering

E. Lidorikis


An important effect when metallic nanoparticles are irradiated by light at the proper frequency is the surface plasmon resonance (SPR), a collective resonant excitation of the nanoparticle's conduction electrons, resulting into enhanced absorption, scattering, and large near-fields close to the nanoparticle surface. We derive analytic closed-form expressions within the framework of a discrete dipole approximation, for two applications involving such nanoparticles: (i) enhancement of semiconductor absorption and (ii) enhancement of Raman scattering, and explore their dependence on nanoparticle shape, distribution and environment. Comparisons with accurate finite-difference time-domain (FDTD) simulations show excellent agreement.


Plasmonics; Near-field; Light scattering from Metal Nanoparticles

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