Hybridization and the origin of the Fano resonances in symmetric nanoparticle trimers

Abstract

We study the light scattering by plasmonic and dielectric symmetric trimers to investigate the existence of polarization-independent Fano resonances. Plasmonic hybridization theory is revealed to hide simple physics, and we instead provide a simplified model for hybridization to derive a plasmonic trimer's eigenmodes analytically. This approach is demonstrated to accurately recreate full wave simulations of plasmonic trimers and their Fano resonances. We are subsequently able to deduce the grounds for modal interference in plasmonic trimers and the related formation of Fano resonances. However, by taking advantage of the generality of our simplified hybridization approach, we are also able to investigate the eigenmodes of all-dielectric trimers. We show that bianisotropic coupling channels between high-index dielectric nanoparticles are able to increase the capacity for Fano resonances, even at normal incidence. We finally provide the first experimental measurements of sharp, polarization-independent Fano resonances from a symmetric all-dielectric trimer, with very good agreement to the predicted response from our simplified hybridization theory.

arXiv comment22 pages, 5 figures

References in corpus (10)

• Fano resonances in nanoscale structures
• The physics of exceptional points
• Magnetic light
• Exceptional Points of Non-hermitian Operators
• Fano-type interpretation of red shifts and red tails in hole array transmission spectra
• Role of Wood anomalies in optical properties of thin metallic films with a bidimensional array of subwavelength holes
• Revisiting the physics of Fano resonances for nanoparticle oligomers
• Interplay of magnetic responses in all-dielectric oligomers to realize magnetic Fano resonances
• Optically-isotropic responses induced by discrete rotational symmetry of nanoparticle clusters
• The resonant dynamics of arbitrarily-shaped meta-atoms

Cited by in corpus (5)

• Cooperative eigenmodes and scattering in 1D atomic arrays
• Asymmetric Backscattering from the Hybrid Magneto-Electric Meta Particle
• Nonlinear circular dichroism in Mie-resonant nanoparticle dimers
• Multiple invisibility regions induced by symmetry breaking in a trimer of subwavelength graphene-coated nanowires
• All-Dielectric Nanophotonic Structures: Exploring the Magnetic Component of Light