Devizis A, Vaicikauskas V, Gulbinas V
Institute of Physics, Vilnius, Lithuania.
Appl Opt. 2006 Apr 10;45(11):2535-9. doi: 10.1364/ao.45.002535.
A time-resolved reflection pump-probe method was combined with a surface plasmon resonance technique in Kretschmann geometry for the investigation of ultrafast light-induced processes in thin films. Transient changes in the gold layer's reflectivity were observed when the layer was excited by 3 ps duration pulses with photon energy exceeding the interband transition and by probing with photon energy close to the interband transition. Comparison of the experimental and modeling results has shown that the imaginary part of the dielectric function of gold increases linearly during excitation, whereas the real part remains unchanged. The decay of the light-induced changes has two components. The first component is faster than the pulse duration, and the second is much longer than 1.5 ns; they are related to cooling of the electron plasma and lattice, respectively.
一种时间分辨反射泵浦-探测方法与表面等离子体共振技术在Kretschmann结构中相结合，用于研究薄膜中的超快光诱导过程。当金层被持续时间为3 ps、光子能量超过带间跃迁的脉冲激发，并通过光子能量接近带间跃迁的探测光进行探测时，观察到金层反射率的瞬态变化。实验结果与模拟结果的比较表明，金的介电函数虚部在激发过程中呈线性增加，而实部保持不变。光诱导变化的衰减有两个分量。第一个分量比脉冲持续时间快，第二个分量比1.5 ns长得多；它们分别与电子等离子体和晶格的冷却有关。
