等离子体激元辅助激光器中的光热非线性
The photothermal nonlinearity in plasmon-assisted photocatalysis
摘要：
理解金属纳米粒子中照明与温度之间的复杂关系对于阐明照明在依赖于等离子体增强但对温度也敏感的各种物理过程中的作用至关重要。最近的研究表明，在强烈的光照下，金属纳米颗粒的光学厚度的集合体的温度上升是由主机的热导率，而不是由金属或主机的光学性能。在这里，我们表明，主机的热导率的温度依赖性主导这些系统的非线性光热响应。特别是，这种依赖性通常会导致温度上升变得强烈的次线性，甚至达到百分之几十。然后，我们表明，这可以解释在最近的几个等离子体激元辅助的双折射实验的实验观察。这表明，在等离子体激元辅助的非热电子的主导地位的任何索赔必须首先考虑这种光热非线性机制。
英文摘要：
Understanding the intricate relation between illumination and temperature in metallic nano-particles is crucial for elucidating the role of illumination in various physical processes which rely on plasmonic enhancement but are also sensitive to temperature. Recent studies have shown that the temperature rise in optically-thick ensembles of metal nanoparticles under intense illumination is dominated by the thermal conductivity of the host, rather than by the optical properties of the metal or the host. Here, we show that the temperature dependence of the thermal conductivity of the host dominates the nonlinear photothermal response of these systems. In particular, this dependence typically causes the temperature rise to become strongly sublinear, reaching even several tens of percent. We then show that this can explain experimental observations in several recent plasmon-assisted photocatalysis experiments. This shows that any claim for dominance of non-thermal electrons in plasmon-assisted photocatalysis must account first for this photothermal nonlinear mechanism.
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