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IEEE Journal of Quantum Electronics

Experimental observation of optical bistability by excitation of a surface plasmon wave

P. Martinot, A. Köster, S. Laval

Published Aug 1, 1985• 41 citations
Publisher

Abstract

Optical bistability has been observed with an original device using CW surface plasmon excitation by ATR through CS2, in which refractive index variations are thermally induced. A simple model describes the operation of this device.
DOI
10.1109/jqe.1985.1072797

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We have theoretically analysed the optical bistability due to the excitation of surface plasmon polaritons (SP's) in samples, prism/metal film/nonlinear optic medium and prism/gap material/metal film/non-linear optic medium, where the non-linear optic medium has an intensity-dependent refractive index. We considered two cases, i.e. non-linearity along the propagation direction of SP's and along the normal to the interface. In the former case, the critical input power for the optical bistability was too high to allow experimental observation, while it was reasonably low for the latter case.
Wysin et al1 suggested that the local field enhancement near a metal surface which occurs if surface plasmons are excited in a metal film, can be useful for observing optical bistability arising from the nonlinearity of the Kerr medium. Other geometrical arrangements2 have also been suggested. These studies assume plane waves in the nonlinear medium and use the Fresnel formulae for reflection and refraction from a layered medium but with linear refractive index replaced by the nonlinear refractive index. This assumes that the fields in the medium are homogeneous. However if surface plasmons are excited, then the fields are inhomogeneous and one has the problem of reflection and refraction from an inhomogeneous layered medium. The inhomogeneity is to be determined self consistently. Thus a proper treatment of optical bistability with surface plasmons should use the nonlinear solutions of the wave equation in Kerr medium. This is what we do in this paper.