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Journal of the Physical Society of Japan

Optical Bistability Associated with Surface Plasmon Polariton Excitation

Toshihiro Okamoto, Masanobu Haraguchi, Masuo Fukui

Published May 15, 1992• 2 citations
Publisher

Abstract

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.

DOI
10.1143/jpsj.61.1549

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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.
Optical bistability based on surface plasmon polaritons in the Kretschmann configuration involving a Kerr nonlinear medium is described by analytical solutions. The conditions of forming the optical bistability with different parameters are explored. The resonant angle of surface plasmon polaritons varying with the incident light intensity also generates the phenomenon of bistability. The system could form optical bistability with the special thickness of the metal film and incident angle. This kind of system has potential application in all-optical networks.
We consider an attenuated total reflection prism-coupling geometry used to excite surface-plasmon waves along a metal film, bounded by a substrate with an intensity-dependent dielectric constant. Nonlinear wave theory is developed in the infinite incident plane-wave approximation, assuming a dielectric constant proportional to the square of the electric field normal to the film. We calculate the intensity required to observe bistability in the reflected intensity by excitation of the nonlinear, long-range surface plasmon and find it to be 2 orders of magnitude less than that required for the nonlinear, single-surface plasmon. We compare the nonlinear wave analysis with other approaches and illustrate the effects of the sign of the nonlinearity and of a nonlinear coupling layer.
We have numerically investigated optical bistability (OB) in a TaFD9 prism/Ag film/PDA-4BCMU film/air geometry. 4BCMU films are dealt as nonlinear optic films with Kerr nonlinearity. In the geometry of our interest surface plasmon polaritons and guided waves can be excited. Numerical calculations have been carried out for TE- and TM-polarized incident lights. In the case of guided waves the critical power density required for OB is less than 1 W/cm 2 under a certain condition. This is a promising value to realize actual optic devices.