Electron dynamics and surface plasmon resonance nonlinearities in metal nanoparticles
Electron dynamics and surface plasmon resonance nonlinearities in metal nanoparticles
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DOI：
10.1016/s0301-0104(99)00304-3
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发表时间：
2000-01-01
期刊：
影响因子：
2.3
通讯作者：
Nakamura, A
中科院分区：
文献类型：
--
作者：
Del Fatti, N;Vallée, F;Nakamura, A
根据玻璃基质中银纳米粒子的高灵敏度飞秒泵浦探测实验结果，讨论了金属纳米粒子中的超快表面等离子体共振非线性及其与导带电子动力学的关系。光学响应可以用表面等离子体共振的频移和展宽来解释，并与电子分布的超快微扰引起的金属纳米粒子介电函数的变化有关。结果表明，能带间吸收的改变是引起表面等离子体共振红移和极短时延展宽的原因，这与数值模拟和银膜测量结果一致。在较长的时间尺度上，证明了由于电子在表面的散射增加而产生的一种新的非线性机制。这一机制对小颗粒的超快非线性光学响应起着重要的作用。(C)2000 Elsevier Science B.V.保留所有权利。
The ultrafast surface plasmon resonance nonlinearities and their connection with the conduction band electron dynamics are discussed in metal nanoparticles in the light of the results of high sensitivity femtosecond pump-probe experiments in silver nanoparticles embedded in a glass matrix. The optical response is interpreted in terms of frequency shift and broadening of the surface plasmon resonance and is related to the changes of the metal nanoparticle dielectric function induced by ultrafast perturbation of the electron distribution. Alteration of the interband absorption is found to be responsible for the observed red shift and very short time delay broadening of the surface plasmon resonance, in agreement with numerical simulations and with measurements in silver films. On a longer time scale, a new nonlinear mechanism due to increase of the electron scattering off the surfaces is demonstrated. This mechanism, specific to confined system, plays an important role in the ultrafast nonlinear optical response of small nanoparticles. (C) 2000 Elsevier Science B.V. All rights reserved.