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Size and shape effects on the nonlinear optical behavior of silver nanoparticles for power limiters

机译：尺寸和形状对功率限制器银纳米颗粒非线性光学行为的影响

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摘要

The optical limiting behavior of silver nanoparticles with different sizes and shapes is investigated and compared to the optical limiting performance of conventional carbon black suspension (CBS). The optical limiting behavior is characterized by means of nonlinear transmittance and scattered intensity measurements when submitted to nanosecond pulsed Nd:YAG lasers operating at the fundamental or the second harmonic wavelength. We found that the optical limiting effect is strongly particle size dependent and the best performance is achieved with the smaller particles. Moreover, it is shown that the surface plasmon resonance is not the main effect responsible for the nonlinear processes. A theoretical model based on the computation of the Mie scattering functions is exposed, and it is shown that the experimental results can be well explained from the calculations.
机译：研究了具有不同尺寸和形状的银纳米粒子的光学极限行为，并将其与常规炭黑悬浮液（CBS）的光学极限性能进行了比较。当受到在基波或二次谐波波长下工作的纳秒脉冲Nd：YAG激光器的影响时，光学极限行为的特征在于非线性透射率和散射强度测量。我们发现光学限制效应在很大程度上取决于颗粒大小，并且使用较小的颗粒可获得最佳性能。此外，表明表面等离子体共振不是引起非线性过程的主要作用。揭示了基于米氏散射函数计算的理论模型，并表明实验结果可以很好地说明计算结果。

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