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Polariton-assisted optics of metal films

By: Yuliy Bludov
From: CFTC
At: Complexo Interdisciplonar, Anfiteatro
[2008-10-08] 12:00

A plane, normally incident electromagnetic wave transmission through the flat metal film whose dielectric constant has small periodical sinusoidal modulation in one dimension parallel to the projection of the electric field onto the film surface is considered. It is shown that the film transmittancy increases considerably when the conditions for resonance interaction of an incident electromagnetic wave with surface plasmon polaritons (SPPs) are met. It is found that for small but finite absorption there are two frequencies in the vicinity of which the transmittancy can achieve the values of the order of unity due to resonances on symmetric and antisymmetric (relative to the mean plane) SPP modes. It is shown that for each value of absorption there exists a certain optimal modulation depth, which maximizes the resonance transparency. Also the excitation of nonlinear surface polariton in the metal film, contacting with the nonlinear medium in one side and the linear medium in other side is investigated. We consider that the nonlinear surface polariton excitation occurs due to the light falling on the metal film from linear medium with the incident angle greater that the total internal reflection angle. The phenomena of photon blockade and optical bistability are predicted.