强连续波照射下的金属纳米球--非微扰非线性纳米光子学的一个特例
Metal nanospheres under intense continuous wave illumination - a unique case of non-perturbative nonlinear nanophotonics
摘要：
我们表明，标准微扰（即，立方）描述小金属纳米球对强连续波照射的热非线性响应已经不足以超过几十度的温度升高。在某些情况下，五阶非线性响应足以准确地描述温度，介电常数和场的强度依赖性，而在其他情况下，需要完整的非微扰描述。我们进一步分析的相对重要性的各种贡献的热非线性，确定Au和Ag之间的质的差异，并表明，主机的热光学非线性通常起着次要的作用，但它的热导率是重要的。
英文摘要：
We show that the standard perturbative (i.e., cubic) description of the thermal nonlinear response of small metal nanospheres to intense continuous wave illumination is insufficient already beyond temperature rises of a few tens of degrees. In some cases, a cubic-quintic nonlinear response is sufficient to describe accurately the intensity dependence of the temperature, permittivity and field, while in other cases, a full non-perturbative description is required. We further analyze the relative importance of the various contributions to the thermal nonlinearity, identify a qualitative difference between Au and Ag, and show that the thermo-optical nonlinearity of the host typically plays a minor role, but its thermal conductivity is important.
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