Nanoscale Control of Optical Heating in Complex Plasmonic Systems
Nanoscale Control of Optical Heating in Complex Plasmonic Systems
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DOI：
10.1021/nn901144d
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发表时间：
2010-02-01
期刊：
影响因子：
17.1
通讯作者：
Javier Garcia de Abajo, F.
中科院分区：
文献类型：
--
作者：
Baffou, Guillaume;Quidant, Romain;Javier Garcia de Abajo, F.
本文介绍了一种数值方法来研究任意复杂的等离子体激元系统在外部光照下的温度分布。两种等离子体激元系统的调查，以说明这种技术的潜力。首先，我们专注于具有各种形态的单个颗粒。与静电学类似，我们引入了热容的概念。这个几何相关的量使我们能够从其吸收截面的唯一知识来评估等离子体粒子内部的温度增加。我们给出了椭圆体、棒、盘和环的通用热电容曲线。此外，我们调查组装的纳米粒子在附近，并表明，尽管其扩散性质，温度分布可以是高度不均匀的，即使在纳米级使用等离子体系统。一个显着程度的纳米级控制的个别温度的相邻颗粒的证明，取决于外部光的波长和入射方向。我们说明了这一概念与模拟金球二聚体和链在水中。我们的工作为选择性控制过程开辟了新的可能性，例如纹理材料动态图案化的局部熔化，化学和代谢热活化，以及在纳米级空间精度下产生机械运动的热传递。
We introduce a numerical technique to investigate the temperature distribution in arbitrarily complex plasmonic systems subject to external illumination, We perform both electromagnetic and thermodynamic calculations based upon a time-efficient boundary element method. Two kinds of plasmonic systems are investigated in order to illustrate the potential of such a technique. First, we focus on individual particles with various morphologies. In analogy with electrostatics, we introduce the concept of thermal capacitance. This geometry-dependent quantity allows us to assess the temperature increase inside a plasmonic particle from the sole knowledge of its absorption cross section. We present universal thermal-capacitance curves for ellipsoids, rods, disks, and rings. Additionally, we investigate assemblies of nanoparticles in close proximity and show that, despite its diffusive nature, the temperature distribution can be made highly non-uniform even at the nanoscale using plasmonic systems. A significant degree of nanoscale control over the individual temperatures of neighboring particles is demonstrated, depending on the external light wavelength and direction of incidence. We illustrate this concept with simulations of gold sphere dimers and chains in water. Our work opens new possibilities for selectively controlling processes such as local melting for dynamic patterning of textured materials, chemical and metabolic thermal activation, and heat delivery for producing mechanical motion with spatial precision in the nanoscale.