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Huygens sources are elements that scatter light in the forward direction asused in the Huygens-Fresnel principle. They have remained fictitious untilrecently where experimental systems have been fabricated. In this letter, wepropose isotropic meta-atoms that act as Huygens sources. Using clusters ofplasmonic or dielectric colloidal particles, Huygens dipoles that resonate atvisible frequencies can be achieved with scattering cross-sections as high as 5times the geometric cross-section of the particle surpassing anythingachievable with a hypothetical simple spherical particle. Examples are giventhat predict extremely broadband scattering in the forward direction over a1000 nm wavelength range at optical frequencies. These systems are important tothe fields of nanoantennas, metamaterials and wave physics in general as wellas any application that requires local control over the radiation properties ofa system as in solar cells or bio-sensing.

Isotropic Huygens dipoles and multipoles with colloidal particles