Abstract
Third order nonlinear optical materials are promising candidates for ultrafast optical switches, optical limiting and optical communication applications. Very promising materials are dielectrics containing metal nanoparticles having large third (higher order) order nonlinear susceptibility χ(3) or equivalently a large nonlinear refraction n2. The expected growth of nonlinear susceptibility is due to the surface plasmon resonance (SPR) that enhanced the local electric field [1]. By choosing the excitation wavelength at the transparency regime of the sample, one expects a large imaginary contribution to the nonlinearities (two-or three photon absorption) or a dominant contribution from nonlinear refractive index. It is expected that the nonlinear optical properties can be varied similarly as the linear properties by modification of concentration, size and shape of the nanoparticles and dielectric functions of the materials [2].
© 2009 IEEE
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