具有胶体粒子的各向同性惠更斯偶极子和多极子
Isotropic Huygens dipoles and multipoles with colloidal particles
摘要：
惠更斯光源是如在惠更斯-菲涅耳原理中使用的在前向方向上散射光的元件。它们一直是虚构的，直到最近才制造出实验系统。在这封信中，我们提出各向同性的元原子作为惠更斯源。使用等离子体或介电胶体颗粒的簇，可以实现在可见频率下谐振的惠更斯偶极子，其散射截面高达颗粒几何截面的5倍，超过了假设的简单球形颗粒可实现的任何散射截面。给出的例子，预测在1000 nm的波长范围内，在光频率的前向方向上的极宽带散射。这些系统对于纳米天线、超材料和波动物理学领域以及任何需要局部控制系统辐射特性的应用（如太阳能电池或生物传感）都很重要。
英文摘要：
Huygens sources are elements that scatter light in the forward direction as used in the Huygens-Fresnel principle. They have remained fictitious until recently where experimental systems have been fabricated. In this letter, we propose isotropic meta-atoms that act as Huygens sources. Using clusters of plasmonic or dielectric colloidal particles, Huygens dipoles that resonate at visible frequencies can be achieved with scattering cross-sections as high as 5 times the geometric cross-section of the particle surpassing anything achievable with a hypothetical simple spherical particle. Examples are given that predict extremely broadband scattering in the forward direction over a 1000 nm wavelength range at optical frequencies. These systems are important to the fields of nanoantennas, metamaterials and wave physics in general as well as any application that requires local control over the radiation properties of a system as in solar cells or bio-sensing.
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