Spectral tunability of a plasmonic antenna with a dielectric nanocrystal

TL;DR

This paper demonstrates how placing a dielectric nanocrystal near a gold nanoantenna can precisely tune its plasmonic resonances and enhance luminescence, advancing hybrid quantum emitter applications.

Contribution

It introduces a method to tune plasmonic modes via dielectric object positioning and explores luminescence coupling, offering new control in nanoantenna-emitter systems.

Findings

Dielectric nanocrystal positioning tunes plasmonic spectra.

Gold luminescence couples efficiently to plasmon modes.

Enhanced polarization anisotropy observed in luminescence.

Abstract

We show that the positioning of a nanometer length scale dielectric object, such as a diamond nanocrystal, in the vicinity of a gold bowtie nanoantenna can be used to tune the plasmonic mode spectrum on the order of a linewidth. We further show that the intrinsic luminescence of gold enhanced in the presence of nanometer-scale roughness couples efficiently to the plasmon mode and carries the same polarization anisotropy. Our findings have direct implications for cavity quantum electrodynamics related applications of hybrid antenna-emitter complexes.