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arXiv 1607.03481physics.optics
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高温非线性等离子体激元

Nonlinear plasmonics at high temperatures

Yonatan Sivan, Shi-Wei Chu

摘要:

我们解决麦克斯韦方程和热方程自洽的金属纳米粒子在强烈的连续波(CW)照明。与以前的研究不同,我们依赖于{ \em实验}测量的数据的金属介电常数增加的温度和可见光谱范围。我们表明,金属的热非线性可以导致大量的偏离线性模型的预测的温度和场分布,因此,可以定性地解释实验观察到的这种配置的强非线性散射。我们还表明,现有数据的不完整性的系统的热性能的温度依赖性,防止达到定量测量和计算的散射数据之间的协议。这种建模方法是必不可少的识别的基本物理机制负责的金属的热光学非线性,并应采用在高温非线性等离子体激元的所有应用,特别是对于难熔金属,无论是连续波和脉冲照明。

英文摘要:

We solve the Maxwell and heat equations self-consistently for metal nanoparticles under intense continuous wave (CW) illumination. Unlike previous studies, we rely on {\em experimentally}-measured data for the metal permittivity for increasing temperature and for the visible spectral range. We show that the thermal nonlinearity of the metal can lead to substantial deviations from the predictions of the linear model for the temperature and field distribution, and thus, can explain qualitatively the strong nonlinear scattering from such configurations observed experimentally. We also show that the incompleteness of existing data of the temperature dependence of the thermal properties of the system prevents reaching a quantitative agreement between the measured and calculated scattering data. This modelling approach is essential for the identification of the underlying physical mechanism responsible for the thermo-optical nonlinearity of the metal and should be adopted in all applications of high temperature nonlinear plasmonics, especially for refractory metals, both for CW and pulsed illumination.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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