Browsing by Author "Yilmaz, Alpay"

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    Disorder-Engineered Hybrid Plasmonic Cavities for Emission Control of Defects in HBN
    (American Chemical Society, 2026) Genc, Sinan; Yucel, Oguzhan; Aglarci, Furkan; Rodriguez-Fernandez, Carlos; Yilmaz, Alpay; Caglayan, Humeyra; Bek, Alpan
    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.
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    Enhanced Photoluminescence From Quantum Emitter-Nanoplasmonic Antenna Hybridization by a Facile Fabrication Method
    (IEEE, 2024) Genc, Sinan; Yilmaz, Alpay; Fernandez, Carlos Rodriguez; Caglayan, Humeyra; Bek, Alpan
    Gaps between tiny metallic nanostructures create strong local fields and small mode volumes, known as hybrid plasmonic modes. This study introduces a nanocavity formed by silver nanoparticles on a gold substrate with hexagonal boron nitride flakes, boosting quantum emitters' spontaneous emission and photoluminescence yield.