Abstract
Low-loss plasmonic materials are highly desired in plasmonics-based light emitting devices, optical sensors, and solar cells. A Dutch-Belgian team finds in periodic arrays of nanorods a new class of plasmonic resonant modes that have the lowest losses reported so far, and explains how they come about.
Highlights
Metallic nanoparticles supporting surface-plasmon resonances allow light to be localized in nanoscale volumes, thereby opening exciting possibilities such as nanoscale control of emitters [1], large electromagnetic enhancements [2], and nonlinear nano-optics [3]
We introduce a coupled-oscillator analog to the plasmonic crystal, which serves to elucidate the physics of the coupled plasmonic resonances and which is used to estimate very high quality factors for surface lattice resonances (SLRs)
Much attention has been given to localized surface-plasmon resonances (LSPRs), which arise in individual particles when their conduction electrons are coherently driven by an electromagnetic field
Summary
A recent development in nanoplasmonics deals with collective resonances in periodic arrays of metallic nanostructures, or plasmonic crystals Such arrays support surface lattice resonances (SLRs), which are collective resonances mediated by diffractive coupling of localized plasmons. This coupling occurs near the critical frequency at which a diffraction order is radiating in the plane of the array, i.e., at the Rayleigh anomaly. We demonstrate the mutual coupling of SLRs and the formation of a frequency stop gap in the dispersion relation of these modes This coupling leads to a strong modification of the SLRs characteristics, including the onset of subradiant damping in the low-frequency band, zero group-velocity modes in the high-frequency band, and Q factors for both bands, which are amongst the highest reported for any 2D plasmonic crystal.
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