Coupling of single NV Center to adiabatically tapered optical single mode fiber

TL;DR

This paper presents a reliable method for coupling diamond nanocrystals with NV centers to tapered optical fibers, significantly improving photon collection efficiency and demonstrating single-photon emission with suppressed background fluorescence.

Contribution

The study introduces a simple technique for coupling NV centers to tapered fibers and achieves enhanced photon collection and reduced background fluorescence compared to traditional methods.

Findings

Achieved over 3x improvement in photon collection efficiency.

Successfully demonstrated single-photon emission at the fiber end.

Suppressed fiber fluorescence below NV center emission level.

Abstract

We demonstrated a simple and reliable technique of coupling diamond nanocrystal containing NV center to tapered optical fiber. We carefully studied fluorescence of the fiber itself and were able to suppress it to the level lower than single photon emission from the NV center. Single photon statistics was demonstrated at the fiber end as well as up to 3 times improvement in collection efficiency with respect to our confocal microscope