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Conference on Lasers and Electro-Optics

Spontaneous Emission from Nanodiamond NV Color Centers on Structured Surfaces

Faraz Ahmed Inam, T. Gaebel, Carlo Bradac, Luke Stewart, Michael J. Withford, Judith M. Dawes, Michael J. Steel, J. R. Rabeau

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We measure distributions of emission rates of single nitrogen vacancy color centers in nanodiamond crystals on distinct surfaces. Comparison to calculations shows emission is strongly influenced by dipole orientation relative to surface interfaces.
DOI
10.1364/cleo_at.2011.jthb23

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Spontaneous emission from crystal centers is influenced by both the photonic local density of states and non-radiative processes. Here, we monitor the spontaneous emission of single nitrogen vacancy (NV) centers as their host diamond is reduced in size from a large monolithic crystal to a nanocrystal by successive cycles of oxidation. The size reduction induces a quenching of the NV radiative emission. Additional non-radiative channels lead to a decrease of the fluorescence intensity and the excited state lifetime. In one case, we observe the onset of blinking which may provide a route to understand these additional non-radiative decay channels.
Spontaneous emission (SE) of nitrogen-vacancy centers (NV-centers), which are contained in a single nanodiamond (ND), placed near a silver nanocube, is investigated both experimentally and theoretically. The ND-cube system is assembled with an atomic force microscope, allowing us to directly compare its SE properties to that of the isolated ND. It is demonstrated that the cube coupled NV-centers exhibit strongly polarized SE. For optimal pump laser polarization, the rate of photons is enhanced by a factor of 4.1, with the excited state lifetime being reduced by a factor of 4.1. The enhancement of photon rate is a consequence of local field enhancement of the pump laser, while the SE polarization and lifetime reduction results from coupling of NV-centers to the localized surface plasmon mode of the nanocube. The experimental observations are in qualitative agreement with the model of SE from randomly oriented electric dipoles, allowing us to reveal the underlying physics of the investigated configuration.