Unidirectional single-photon emission from germanium-vacancy zero-phonon lines: Deterministic emitter-waveguide interfacing at plasmonic hot spots

Abstract

Striving for nanometer-sized solid-state single-photon sources, we investigate atom-like quantum emitters based on single germanium vacancy (GeV) centers isolated in crystalline nanodiamonds (NDs). Cryogenic characterization indicated symmetry-protected and bright (> 10^6 counts/s with off-resonance excitation) zero-phonon optical transitions with up to 6-fold enhancement in energy splitting of their ground states as compared to that found for GeV centers in bulk diamonds (i.e., up to 870 GHz in highly strained NDs vs 150 GHz in bulk). Utilizing lithographic alignment techniques, we demonstrate an integrated nanophotonic platform for deterministic interfacing plasmonic waveguides with isolated GeV centers in NDs that enables 10-fold enhancement of single-photon decay rates along with the emission direction control by judiciously designing and positioning a Bragg reflector. This approach allows one to realize the unidirectional emission from single-photon dipolar sources introducing a novel method that is alternative to the propagation-direction-dependent techniques based on chiral interactions or topological protection. The developed plasmon-based nanophotonic platform opens thereby new perspectives for quantum nanophotonics in general and for realizing entanglement between single photons and spin qubits, in particular.

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Cited by in corpus (8)

• Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
• Mono-crystalline Gold Platelets: A High Quality Platform for Surface Plasmon Polaritons
• Enhanced Spectral Density of a Single Germanium Vacancy Center in a Nanodiamond by Cavity-Integration
• Structural and optical properties of monocrystalline and polycrystalline gold plasmonic nanorods
• Anisotropic Second Harmonic Generation From Monocrystalline Gold Flakes
• On-chip Single-crystal Plasmonic Optoelectronics for Efficient Hot Carrier Collection and Photovoltage Detection
• Highly efficient coupling of single photons using a pair of nanostructures
• Orbitally resolved single-photon emission from an individual atomic vacancy center in a semiconductor