Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride

Single photon emitters (SPEs) hosted in hexagonal boron nitride (hBN) are essential elementary building blocks for enabling future on-chip quantum photonic technologies that operate at room temperature. However, fundamental challenges, such as managing non-radiative decay, competing incoherent proce...

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Bibliographic Details
Published in:arXiv.org 2024-05
Main Authors: Mashnoon Alam Sakib, Triplett, Brandon, Harris, William, Hussain, Naveed, Senichev, Alexander, Momenzadeh, Melika, Bocanegra, Joshua, Wu, Ruqian, Boltasseva, Alexandra, Shalaev, Vladimir M, Shcherbakov, Maxim R
Format: Article
Language:English
Subjects:
Aluminum oxide
Arrays
Boron nitride
Defects
Density functional theory
Emission
Emitters
Gold
Gold coatings
Information systems
Light sources
Photoluminescence
Photons
Plasmonics
Quantum phenomena
Room temperature
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Summary:Single photon emitters (SPEs) hosted in hexagonal boron nitride (hBN) are essential elementary building blocks for enabling future on-chip quantum photonic technologies that operate at room temperature. However, fundamental challenges, such as managing non-radiative decay, competing incoherent processes, as well as engineering difficulties in achieving deterministic placement and scaling of the emitters, limit their full potential. In this work, we experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs by engineering emitter-cavity coupling and enhancing radiative emission at room temperature. The plasmonic nanoresonator architecture consists of gold-coated silicon pillars capped with an alumina spacer layer, enabling a 10-fold local field enhancement in the emission band of native hBN defects. Confocal photoluminescence and second-order autocorrelation measurements show bright SPEs with sub-30 meV bandwidth and a saturated emission rate of more than 3.8 million counts per second. We measure a Purcell factor of 4.9, enabling average SPE lifetimes of 480 ps, a five-fold reduction as compared to emission from gold-free devices, along with an overall SPE yield of 21%. Density functional theory calculations further reveal the beneficial role of an alumina spacer between defected hBN and gold, as an insulating layer can mitigate the electronic broadening of emission from defects proximal to gold. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
ISSN:2331-8422