Characteristics of quantum emitters in hexagonal boron nitride suitable for integration with nanophotonic platforms

Schauffert, Hardy; Stewart, James; Ali, Sajid; Walser, Stefan; Hörner, Helmut; Prasad, Adarsh S.; Бабенко, В. В.; Ye, Fan; Eder, Dominik; Thygesen, Kristian Sommer; Hofmann, Stephan; Bayer, Bernhard C.; Skoff, Sarah M.

doi:10.48550/arxiv.2210.11099

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“…While our identified numbers remain low, they align well with qualitative observations from prior drop-casting experiments. 22,24 Our stepwise analysis underscores that these low figures are not unexpected, given cluster formation during drop-casting (see Figure 2), while not all nanoflakes will carry defect centers that emit under λ exc = 530 nm excitation. Moreover, as the emitters highly depend on the excitation polarization of the laser beam (Figure 3f), not all SPEs will be visible under fixed linear polarization, potentially increasing the actual count.…”

Section: Discussion On Choice Of Solvent and Hbn Suppliermentioning

confidence: 70%

“…30 Experimental studies utilizing drop-casting of hBN nanoflakes observed the generation of SPEs and deposited them onto various substrates and waveguides. 22,24 Despite that these methods are capable of producing SPEs from single hBN nanoflakes, systematic approaches to assess their yield is still in its infancy. 6,31 While previous studies investigating the influence of solvent on SPE quality and yield have utilized exfoliated flakes, 30 similar systematic approaches for dropcasted nanoflakes are missing.…”

Section: ■ Introductionmentioning

confidence: 99%

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Quantitative Investigation of Quantum Emitter Yield in Drop-Casted Hexagonal Boron Nitride Nanoflakes

Kretzschmar,

Ritter,

Kumar

et al. 2024

ACS Appl. Opt. Mater.

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Single photon emitters (SPEs) are a key component for their use as pure photon source in quantum technologies. In this study, we investigate the generation of SPEs from drop-casted hexagonal boron nitride (hBN) nanoflakes, examining the influence of the immersion solution and the source of hBN. We show that, depending on the utilized supplier and solution, the number and quality of the emitters change. We perform a comprehensive optical characterization of the deposited nanoflakes to assess the quality of the generated SPEs. Importantly, we provide quantitative data on SPE yields, highlighting significant variations among solvents and different sources of hBN. We find that hBN from Merck drop-casted in acetone provided the best quality emitters with a g (2) < 0.1 and photoluminescence intensities above 300 kCounts/s. Their number of SPEs among all photon emitters was also the highest, with about 14%, rendering a total yield of about 1.25% of all drop-casted flakes. These numbers hold particular significance when evaluating dropcasting as a practical method for the generation of SPEs and their deposition and incorporation within existing nanophotonic systems. By choosing appropriate solvents and source materials' quality and yield of SPEs can be significantly increased, showcasing further optimization potential for the development of future quantum applications.

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Section: Discussion On Choice Of Solvent and Hbn Suppliermentioning

confidence: 70%