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首页> 外文期刊>Physical review >Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates
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Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates

机译：金和银纳米粒子聚集体的法拉第旋转和圆二色性光谱

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摘要

We study the magneto-optical response of noble metal nanoparticle clusters. We consider the interaction between the light-induced dipoles of particles. In the presence of a magnetic field, the simplest achiral cluster, a dimer, exhibits circular dichroism (CD). The CD of a dimer depends on the directions of the magnetic field and the light wave vector. The CD of a populous cluster weakly depends on the magnetic field. Upon scattering from the cluster, an incident linearly polarized light with polarization azimuth φ becomes elliptically polarized. The polarization azimuth rotation and ellipticity angle variation are sinusoidal functions of 2φ. The anisotropy and the chirality of the cluster control the amplitude and offset of these sinusoidal functions. The Faraday rotation and Faraday ellipticity are also sinusoidal functions of 2φ. Near the surface plasmon frequency, Faraday rotation and Faraday ellipticity increase.
机译：我们研究了贵金属纳米粒子簇的磁光响应。我们考虑了光诱导的偶极子之间的相互作用。在磁场存在下，最简单的非手性簇（二聚体）表现出圆二色性（CD）。二聚体的CD取决于磁场和光波矢量的方向。人口簇的CD弱依赖于磁场。在从团簇散射时，具有偏振方位角φ的入射线性偏振光变成椭圆偏振。极化角旋转和椭圆度角变化是2φ的正弦函数。团簇的各向异性和手性控制这些正弦函数的幅度和偏移。法拉第旋转和法拉第椭圆率也是2φ的正弦函数。在表面等离激元频率附近，法拉第旋转和法拉第椭圆率增加。

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