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Acoustic signals generated by laser-irradiated metal nanoparticles

机译：激光辐照的金属纳米颗粒产生的声信号

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摘要

We present a physical model that explains several sequential stages of the conversion of optical to acoustical energy when irradiating diluted suspensions of metal nanoparticles with laser pulses. Optical absorption and scattering of a single particle driven by plasmon resonance interactions in an aqueous medium are considered. Thermal effects produced by laser-irradiated nanoparticles, dynamics of vapor bubble formation, and acoustic signals from expanding bubbles formed around heated nanoparticles are calculated. Stochastic features of the pressure magnitude emitted as a result of low-fluence irradiation of suspensions are also discussed. The probabilistic distribution of pressure magnitude from individual bubbles was found to obey Zipf's law for low concentrations of nanoparticles, while increasing their concentration brings the pressure magnitude distribution into conformance with the Gaussian law.
机译：我们提供了一个物理模型，解释了当用激光脉冲辐照稀释的金属纳米颗粒悬浮液时，光能转换为声能的几个连续阶段。考虑了在水介质中由等离振子共振相互作用驱动的单个颗粒的光吸收和散射。计算了由激光辐照的纳米粒子产生的热效应，蒸气气泡形成的动力学以及来自加热的纳米粒子周围形成的膨胀气泡的声信号。还讨论了由于悬浮液的低通量辐射而产生的压力大小的随机特征。发现来自单个气泡的压力大小的概率分布对于纳米粒子的低浓度服从齐普夫定律，而增加其浓度会使压力大小分布符合高斯定律。

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