Probing plasmon-NV${}^0$ coupling at the nanometer scale with photons and fast electrons

Abstract

The local density of optical states governs an emitters lifetime and quantum yield through the Purcell effect. It can be modified by a surface plasmon electromagnetic field, but such a field has a spatial extension limited to a few hundreds of nanometers, which complicates the use of optical methods to spatially probe the emitter-plasmon coupling. Here we show that a combination of electron-based imaging, spectroscopies and photon-based correlation spectroscopy enables measurement of the Purcell effect with nanometer and nanosecond spatio-temporal resolutions. Due to the large variability of radiative lifetimes of emitters embedded in nanoparticles with inhomogeneous sizes we relied on a statistical approach to unambiguously probe the coupling between nitrogen-vacancy centers (NV^0) in nanodiamonds and surface plasmons in silver nanocubes. We quantified the Purcell effect by measuring the NV^0 excited state lifetimes in a large number of either isolated nanodiamonds or nanodiamond-nanocube dimers and demonstrated a statistically significant lifetime reduction for dimers.

References in corpus (4)

• On-command enhancement of single molecule fluorescence using a gold nanoparticle as an optical nano-antenna
• Nanometer Scale Spectral Imaging of Quantum Emitters in Nanowires and Its Correlation to Their Atomically Resolved Structure
• Spatially resolved quantum nano-optics of single photons using an electron microscope
• Enhanced spontaneous emission from nanodiamond colour centres on opal photonic crystal

Cited by in corpus (1)

• Electron-induced state conversion in diamond NV centers measured with pump-probe cathodoluminescence spectroscopy