纳米颗粒光热效应及基底介质相变分析

Analysis of Photothermal Effect of Nanoparticles and Phase Transition of Matrix Media

不同形状及成分的纳米结构的光热转换广泛应用于太阳能收集和储存、肿瘤光热疗法、纳米化学以及微流控光学中。在这些应用中,精确控制纳米尺度的光吸收和温度分布至关重要。因此,本文研究了激光辐照下等离激元纳米颗粒二聚体周围基底介质的相变和温度分布情况。得出了金纳米立方体和长方体的光学性质随波长的变化规律,分析了其二聚体在不同排列分布时吸收因子随颗粒距离的变化情况。研究了纳米长方体二聚体在呈不同排列分布时在特定波长处热源分布和温度分布随入射光偏振角的变化规律,结果表明可以通过调节光偏振角来控制纳米级的温度分布和相变情况。

Nanoparticles with different shapes and materials have been widely applied in the field of solar energy collection and storage,photothermal therapy,nanochemistry,and optofluidics.In the above mentioned applications,the precise control of light absorption and temperature distribution in nanoscale is very important.Therefore,in the present work,we studied the phase transition and temperature distribution around plasmonic nanoparticle dimers under the illumination of laser.The optical properties of gold nanocube and nanocuboid were obtained.The dependence of absorption efficiency of nanodimers on the interpaxticle distance is investigated.On this basis,we studied the influence of polarizing angle of incident light on the heat source and temperature distribution of nanocuboid dimers in different arrangement.The results show that the nanoscale temperature distribution and phase transition can be manipulated precisely by adjusting the polarizing angle of incident light.