arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.1218physics.optics
收藏

金属纳米粒子对上转换过程的影响

Influence of metallic nanoparticles on upconversion processes

R. Esteban, M. Laroche, J. -J. Greffet

摘要:

众所周知,拉曼散射和荧光可以通过金属纳米颗粒的存在而增强。在这里,我们推导出简单的方程来分析金属纳米颗粒对非辐射能量转移或激发态吸收等上转换过程的影响。我们比较所得的表达式与更熟悉的拉曼和荧光的情况下,并找到显着的差异。我们使用数值模拟来计算通过不同半径的金属球可实现的上转换信号增强,并发现在红外频率下半径为100- 400 nm的粒子是有利的。我们还讨论了相当大的挑战,涉及使用金属颗粒,以提高上转换为太阳能。

英文摘要:

It is well known that Raman scattering and fluorescence can be enhanced by the presence of metallic nanoparticles. Here, we derive simple equations to analyse the influence of metallic nanoparticles on upconversion processes such as non-radiative energy transfer or excited state absorption. We compare the resulting expressions with the more familiar Raman and fluorescence cases, and find significant differences. We use numerical simulations to calculate the upconverted signal enhancement achievable by means of metallic spheres of different radii, and find particles of 100-400nm radius at infrared frequencies to be favorable. We also discuss the considerable challenges involved in using metallic particles to enhance upconversion for solar energy.

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。

↑