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arXiv 1907.01255physics.optics
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单个金属纳米球光热响应的尺寸依赖性

Size-Dependence of the photothermal response of a single metal nanosphere

Ieng-Wai Un, Yonatan Sivan

摘要:

我们研究了单个球形金属纳米颗粒对连续波照明的热响应随其尺寸的变化。我们发现,颗粒温度随着颗粒尺寸的增加而非单调增加,这表明可以通过调节颗粒尺寸和照明波长来优化光热响应。我们还比较了金和银纳米颗粒的光热效应的尺寸效应,并发现有些令人惊讶的是,银纳米颗粒是更有效的热发生器,只有足够小的尺寸。这些结果主要对于诸如等离子体激元辅助光催化、光热癌症治疗等应用具有重要性,并为研究金属纳米球的热光非线性的尺寸依赖性迈出了第一步。

英文摘要:

We study the thermal response of a single spherical metal nanoparticle to continuous wave illumination as a function of its size. We show that the particle temperature increases non-monotonically as the particle size increases, indicating that the photo-thermal response can be optimized by tuning the particle size and illumination wavelength. We also compare the size-effect on the photo-thermal effects of gold and silver nanoparticles and find somewhat surprisingly that Ag NPs are more efficient heat generators only for sufficiently small sizes. These results have importance primarily for application such as plasmon-assisted photo-catalysis, photothermal cancer therapy, etc., and provide a first step toward the study of the size-dependence of the thermo-optic nonlinearity of metal nanospheres.

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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