Disorder-Engineered Hybrid Plasmonic Cavities for Emission Control of Defects in hBN

Date

2026-02-18

Author

GENÇ, SİNAN
Yücel, Oǧuzhan
Aǧlarcı, Furkan
Rodriguez-Fernandez, Carlos
Yilmaz, Alpay
Caglayan, Humeyra
Ateş, Serkan
Bek, Alpan

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Defect-based quantum emitters in hexagonal boron nitride (hBN) are promising building blocks for scalable quantum photonics due to their stable single-photon emission at room temperature. However, enhancing their emission intensity and controlling the decay dynamics remain significant challenges. This study demonstrates a low-cost, scalable fabrication approach to integrate plasmonic nanocavities with defect-based quantum emitters in hBN nanoflakes. Using the thermal dewetting process, we realize two distinct configurations: stochastic Ag nanoparticles (AgNPs) on hBN flakes and hybrid plasmonic nanocavities formed by AgNPs on top of hBN flakes supported on gold/silicon dioxide (Au/SiO2) substrates. While AgNPs on bare hBN yield up to a 2-fold photoluminescence (PL) enhancement with reduced emitter lifetimes, the hybrid nanocavity architecture provides a dramatic, up to 100-fold PL enhancement and improved uniformity across multiple emitters, all without requiring deterministic positioning. Finite-difference time-domain (FDTD) simulations and time-resolved PL measurements confirm size-dependent control over decay dynamics and cavity–emitter interactions. Our versatile solution overcomes key quantum photonic device development challenges, including material integration, emission intensity optimization, and spectral multiplexity.

Subject Keywords

dewetting, nanocavity, photoluminescence, single photon source

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105030661387&origin=inward
https://hdl.handle.net/11511/118862

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Department of Physics, Article