SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Technologies: Color Centers II (joint session Q/QI)
Q 21.7: Talk
Tuesday, March 7, 2023, 12:30–12:45, F442
Highly-efficient extraction of single photons from silicon vacancy in diamond using plasmonic nanoantenna — Ilya Fradkin1, Mario Agio2, and •Dmitry Fedyanin1 — 1Dolgopudny, Moscow, Russia — 2University of Siegen, Siegen, Germany
Color centers in diamond and related wide-bandgap semiconductors are considered as one of the most promising quantum optoelectronic systems for single-photon sources and spin qubits. However, one of the major obstacles towards their practical exploitation is the high refractive index of diamond, which limits the maximum photon extraction efficiency to only a few percent for a horizontally oriented dipolar emitter, while for a vertically oriented emitter, the collection efficiency is even lower. At the same time, for practical applications, the efficiency of photon extraction of higher than 70% is typically required even at 100% quantum efficiency of the emitter. In this work, we develop a plasmonic nanoantenna that not only dramatically enhances the quantum efficiency of the silicon-vacancy (SiV) center in diamond but also improves the collection efficiency of the vertically oriented emitter by more than two orders of magnitude. We numerically demonstrate that the proposed nanoantenna allows to achieve the collection efficiency of more than 85%. Even more remarkable result is that the collection efficiency almost does not depend on the distance from the SiV center to the nanoantenna at distances from 10 to 100 nm and exceeds 80%, which is particularly beneficial for practical applications.