Surface Plasmon Polariton Self-Focusing by Ponderomotive Forces

Details Surface Plasmon Polariton Self-Focusing by Ponderomotive Forces Surface Plasmon Polariton Self-Focusing by Ponderomotive Forces

2007-08-29

arxiv.org/abs/0708.3959v1

Physics

Optics

Scientific paper

Nonlinear properties of Surface Plasmon Polaritons stemming from the inherent electron plasma nonlinearity of the metal layers are investigated. A fluid-mechanics plasma model is used to describe the electron motion in metals. The nonlinear ponderomotive force repels the electrons from the high field intensity region, effectively reducing the local plasma frequency and the corresponding real part of the refractive index results in Kerr like self-focusing. The field confinement to the low carrier density region also assists also in reducing the propagation losses, which usually inhibit practical nanoplasmonic circuits. Surface plasmon self focusing and nonlinear spectrum modifications, predicted by our model, are demonstrated by preliminary experiments.

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