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Efficient and broadband forward-scattering is a property of prime importancefor meta-atoms if they are to be used in self-assembled metasurfaces. Strongcontenders include colloidal nanoresonators with tailored multipolar content toachieve the proper interferences that suppress back-scattering. We considerdense plasmonic balls composed of more than a hundred silver nanoinclusions.Numerical simulations provide a full understanding of the role played bymultipole moments in the scattering behavior. They are fabricated usingemulsion drying and characterized optically. Strong and efficientforward-scattering is demonstrated over the entire visible range. Electric andmagnetic dipole resonances of equal amplitude and phase are evidenced. Suchplasmonic balls could be used as meta-atoms for bottom-up metasurfaceapplications.

Broadband forward scattering of light by plasmonic balls: role of multipolar interferences