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对基于表面等离子体激元共振(SPR)的飞秒抽运探测技术进行了系统地数字分析.计算结果表明,利用SPR技术可将飞秒抽运探测信号强度ΔR/R提高2—3个数量级,其提高的比例依赖于金属膜的厚度和探测光的入射角,其中R和ΔR分别为探测光反射率的总量和变化量.特别地,对于金属-吸收介质体系,金属膜的介电常数变化对ΔR的影响仅为吸收介质影响的2%,所以ΔR/R主要反应吸收介质中的动力学过程,因此该技术对研究表面和界面的超快动力学过程具有重要的意义.
A systematic numerical analysis of the femtosecond pump detection technique based on surface plasmon resonance (SPR) was carried out. The calculation results show that the SPR technique can increase the femtosecond pump detection signal strength ΔR / R by 2-3 orders of magnitude , The increased proportion of which depends on the thickness of the metal film and the angle of incidence of the probe light, where R and [Delta] R are the total amount and the variation of the probe light reflectance, respectively.For the metal-absorber media system in particular, the dielectric The effect of constant change on ΔR is only 2% of the absorption medium. Therefore, ΔR / R mainly absorbs the kinetic process in the medium, so this technique is of great significance for studying the ultrafast dynamics of the surface and interface.