单个均匀纳米颗粒内环形偶极子的有效激发和调谐
Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles
摘要：
我们重新审视的基本主题的光散射由单一的均匀纳米粒子的激励和操纵的环形偶极子的新视角。结果表明，除了在全介电颗粒，环形偶极子也可以有效地激发均匀的金属纳米颗粒。此外，我们表明，这些环形偶极子激发可以通过调整材料的径向各向异性参数进行光谱调谐，这为进一步更灵活地操纵光子系统内的环形响应铺平了道路。对纳米颗粒内的环形多极子激发和调谐的研究加深了我们对光散射这一开创性问题的理解，并可能孕育许多与散射相关的基础研究和应用。
英文摘要：
We revisit the fundamental topic of light scattering by single homogenous nanoparticles from the new perspective of excitation and manipulation of toroidal dipoles. It is revealed that besides within all-dielectric particles, toroidal dipoles can also be efficiently excited within homogenous metallic nanoparticles. Moreover, we show that those toroidal dipoles excited can be spectrally tuned through adjusting the radial anisotropy parameters of the materials, which paves the way for further more flexible manipulations of the toroidal responses within photonic systems. The study into toroidal multipole excitation and tuning within nanoparticles deepens our understanding of the seminal problem of light scattering, and may incubate many scattering related fundamental researches and applications.
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