Elucidation of pulsed laser-induced morphological changes of gold nanoparticles using transient absorption and single particle spectroscopies

我们将注意力集中在激光-金纳米粒子（Au NP）相互作用的基本方面，这种相互作用导致粒子加热以及能量沉积到周围介质。前者引起颗粒熔化、变形和烧蚀，并对机理进行了讨论。后者通过从颗粒到周围的热传递产生介质温度梯度和局部加热产生的气泡。激光-金- NP相互作用可以应用于材料制造，如通过施加高压和在玻璃基板上制造纳米孔来微调粒度和尺寸分布。我们还提到了小于衍射极限尺寸的温度测量的重要性。我们利用单粒子光谱证明了这可以通过连续波激光-金- NP相互作用来实现。

We focused our attention to the fundamental aspects of the laser-gold nanoparticle (Au NP) interaction that leads to the particle heating as well as energy deposition to the surrounding media. The former gives rise to the particle melting, deformation, and ablation, which has discussion on the mechanism. The latter generates medium temperature gradients and bubbles resulting from local heating through the heat transfer from the particle to the surroundings. The laser-Au NP interaction can be applied to the material fabrication such as fine tuning of particle size and size distribution by applying high pressures and nanohole fabrication on glass substrates. We also refer to the importance of temperature measurements in dimension smaller than the diffraction limit. We show that this can be achieved by CW laser-Au NP interaction by using the single particle spectroscopy.