Lineshape of harmonic generation by metallic nanoparticles and metallic photonic crystal slabs
Lineshape of harmonic generation by metallic nanoparticles and metallic photonic crystal slabs
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DOI：
10.1103/physrevb.72.115113
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Linden, S
中科院分区：
文献类型：
--
作者：
Klein, MW;Tritschler, T;Linden, S
我们研究了金属纳米颗粒（理论）和金属光子晶体板（实验和理论）的线性和非线性光学线形。对于金属纳米粒子合奏，我们分析和数值计算表明，飞秒二次或三次谐波产生（THG）的实验与线性消光测量一般不允许确定均匀的线宽。这与我们发现技术错误的先前工作的声明相反。对于金属光子晶体板，我们引入了一个简单的经典模型的两个耦合洛伦兹振荡器，对应于等离子体和波导模式。该模型很好地描述了线性光学的关键实验特征，特别是类Fano线型。导出的非线性光学三倍频光谱示出依赖于潜在的光学非线性源。我们提出了相应的三倍频实验与金属光子晶体板。与以前的工作相比，我们光谱解析干涉THG信号，并且我们还通过使用5 fs激光脉冲获得更高的时间分辨率。在三倍频光谱中，不同的光谱分量表现出强烈不同的行为与时间延迟。测量的光谱与模型计算吻合得很好。
We study the linear- and nonlinear-optical lineshapes of metal nanoparticles (theory) and metallic photonic crystal slabs (experiment and theory). For metal nanoparticle ensembles, we show analytically and numerically that femtosecond second- or third-harmonic-generation (THG) experiments together with linear extinction measurements generally do not allow to determine the homogeneous linewidth. This is in contrast to claims of previous work in which we identify a technical mistake. For metallic photonic crystal slabs, we introduce a simple classical model of two coupled Lorentz oscillators, corresponding to the plasmon and waveguide modes. This model describes very well the key experimental features of linear optics, particularly the Fano-like lineshapes. The derived nonlinear-optical THG spectra are shown to depend on the underlying source of the optical nonlinearity. We present corresponding THG experiments with metallic photonic crystal slabs. In contrast to previous work, we spectrally resolve the interferometric THG signal, and we additionally obtain a higher temporal resolution by using 5 fs laser pulses. In the THG spectra, the distinct spectral components exhibit strongly different behaviors versus time delay. The measured spectra agree well with the model calculations.