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8 November 2012 Influence of the geometric shape of silver nanoparticles on optical limiting
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The optical limiting behaviour of silver nanoparticles with different sizes and shapes is investigated and compared to the optical limiting performances of conventional carbon black suspension. The optical limiting behaviour is characterized by means of nonlinear transmittance and scattered intensity measurements when submitted to a nanosecond pulsed Nd:YAG laser operating at the fundamental or the second harmonic wavelength. We found that the optical limiting effect is strongly particle size dependent, the best performance achieved with the smaller particles. Moreover, it is shown that the surface plasmon resonance is not the main effect responsible for the nonlinear processes. Especially, the particle size and its implication in the backscattering performance is outlined. A stronger backscattered radiation is observed for the 60 nm sized silver particles in comparison with the 580 nm large ones. Alternatively, a stronger scattering in the forward hemisphere is subsequent to nanoparticles whose sizes are significantly greater.
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Stefanie Dengler, Olivier Muller, Gunnar Ritt, and Bernd Eberle "Influence of the geometric shape of silver nanoparticles on optical limiting", Proc. SPIE 8545, Optical Materials and Biomaterials in Security and Defence Systems Technology IX, 854503 (8 November 2012);

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