Signature of a Fano-resonance in a plasmonic meta-molecule's local density of optical states

Abstract

We present measurements on plasmonic meta-molecules under local excitation using cathodoluminescence which show a spatial redistribution of the local density of optical states (LDOS) at the same frequency where a sharp spectral Fano-feature in the extinction cross section has been observed. Our analytical model shows that both near- and far-field effects arise due to interference of the same two eigenmodes of the system. We present quantitative insights both in a bare state, and in a dressed state picture that describe plasmonic Fano interference either as near-field amplitude transfer between three coupled bare states, or as interference of two uncoupled eigenmodes in the far field. We identify the same eigenmode causing a dip in extinction to strongly enhance the radiative LDOS, making it a promising candidate for spontaneous emission control.

References in corpus (2)

• Past Achievements and Future Challenges in 3D Photonic Metamaterials
• On-command enhancement of single molecule fluorescence using a gold nanoparticle as an optical nano-antenna

Cited by in corpus (16)

• Light interaction with photonic and plasmonic resonances
• Revisiting the physics of Fano resonances for nanoparticle oligomers
• Many-body subradiant excitations in metamaterial arrays: Experiment and theory
• Coherent control of the optical absorption in a plasmonic lattice coupled to a luminescent layer
• Optically-isotropic responses induced by discrete rotational symmetry of nanoparticle clusters
• Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
• Cooperative quantum-optical planar arrays of atoms
• Superemitters in Hybrid Photonic Systems: A Simple Lumping Rule for the Local Density of Optical States and its Break-Down at the Unitary Limit
• From weak to strong coupling of localized surface plasmons to guided modes in a luminescent slab
• Strong radiative interactions and subradiance in disordered metamaterials
• Fano lines in the reflection spectrum of directly coupled systems of waveguides and cavities: measurements, modeling and manipulation of the Fano asymmetry
• Point dipole and quadrupole scattering approximation to collectively responding resonator systems
• Light scattering from coupled plasmonic nanospheres on a substrate
• All-Dielectric Nanophotonic Structures: Exploring the Magnetic Component of Light
• Collective Resonances in Nanoparticle Oligomers
• Double Fano resonances in a composite metamaterial possessing tripod plasmonic resonances