Revisiting the physics of Fano resonances for nanoparticle oligomers

Abstract

We present a new and robust approach for interpreting the physics of Fano resonances in planar oligomer structures of both metallic and dielectric nanoparticles. We reveal a key mechanism for Fano resonances by demonstrating that such resonances can be generated purely from the interference of nonorthogonal collective eigenmodes, which are clearly identified based on the coupled-dipole approximation. We prove analytically a general theorem to identify the number of collective eigenmodes that can be excited in ring-type nanoparticle oligomers and further demonstrate that no dark mode excitation is necessary for existence of Fano resonances in symmetric oligomers. As a consequence, we unify the understanding of Fano resonances for both plasmonic and all-dielectric oligomers.

10 pages, 4 figures

References in corpus (4)

• Directional visible light scattering by silicon nanoparticles
• Magnetic light
• Signature of a Fano-resonance in a plasmonic meta-molecule's local density of optical states
• Optically-isotropic responses induced by discrete rotational symmetry of nanoparticle clusters

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