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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Lineshape of harmonic generation by metallic nanoparticles and metallic photonic crystal slabs
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Lineshape of harmonic generation by metallic nanoparticles and metallic photonic crystal slabs

机译：金属纳米粒子和金属光子晶体平板产生谐波的线形

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摘要

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.
机译：我们研究金属纳米粒子（理论）和金属光子晶体平板（实验和理论）的线性和非线性光学线形。对于金属纳米粒子集合，我们通过分析和数字显示，飞秒第二或第三谐波产生（THG）实验以及线性消光测量通常无法确定均一的线宽。这与我们先前发现技术错误的先前声明相反。对于金属光子晶体平板，我们介绍了两个耦合的Lorentz振荡器的简单经典模型，分别对应于等离激元和波导模式。该模型很好地描述了线性光学的关键实验特征，尤其是法诺式线形。推导得出的非线性光学THG光谱取决于光学非线性的潜在来源。我们提出与金属光子晶体平板相应的THG实验。与以前的工作相比，我们在频谱上解析了干涉THG信号，此外，我们还通过使用5 fs激光脉冲获得了更高的时间分辨率。在THG光谱中，不同的光谱成分随时间延迟表现出截然不同的行为。测得的光谱与模型计算非常吻合。

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