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We propose an alternative way to enhance optical nonlinearity from nanocomposites containing nonlinear bimetallic nanostructures. The optical nonlinearity enhancement are due to two aspects: firstly, the intrinsic large nonlinearity of metallic material in core and shell; secondly, the coupling of dipole modes gives rise to symmetric and antisymmetric resonance, which strengthen the local fields in...
We perform theoretical study of the nonlinear transmission and nonlinear diffraction in nanogratings etched at the surface of copper- and silver-based glass–metal composites. By assuming low metal concentration in the glass matrix, we employ Maxwell Garnett approach to obtain refractive index and absorption coefficient, while the optical nonlinearity of the composite is described using anharmonic...
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