Abstract
Plasmonics is a mature scientific discipline which is now entering the realm of practical applications. Recently, significant attention has been devoted to on-chip hybrid devices where plasmonic nanoantennas are integrated in standard Si3N4 photonic waveguides. Light in these systems is usually coupled at the waveguide apexes by using multiple objectives and/or tapered optical fibers, rendering the analysis of spectroscopic signals a complicated task. Here, we show how by using a grating coupler and a low NA objective, quantitative spectroscopic information similar to standard dark-field spectroscopy can be obtained at the single-nanoparticle level. This technology may be useful for enabling single-nanoparticle studies in non-linear excitation regimes and/or in complex experimental environments, thus enriching the toolbox of nanophotonic methods.
Highlights
Small metallic nanoparticles support collective oscillations of conductive electrons known as localized surface plasmon resonances
Plasmonic nanostructures are promising for a variety of emerging optical processes and phenomena, such as non-linear effects,[3] wave-front manipulation,[4] plasmon-exciton strong coupling,[5] hot-electron generation[6] and light harvesting.[7]
We extend the integration of individual plasmonic nanoparticles with silicon nitride photonic waveguides using grating couplers
Summary
Small metallic nanoparticles support collective oscillations of conductive electrons known as localized surface plasmon resonances. Hybrid dielectric waveguide spectroscopy of individual plasmonic nanoparticles
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