Hybrid device of hexagonal boron nitride nanoflakes with defect centres and a nano-fibre Bragg cavity

authored by: Toshiyuki Tashima, Hideaki Takashima, Andreas W. Schell, Toan Trong Tran, Igor Aharonovich, Shigeki Takeuchi
Abstract: Solid-state quantum emitters coupled with a single mode fibre are of interest for photonic and quantum applications. In this context, nanofibre Bragg cavities (NFBCs), which are microcavities fabricated in an optical nanofibre, are promising devices because they can efficiently couple photons emitted from the quantum emitters to the single mode fibre. Recently, we have realized a hybrid device of an NFBC and a single colloidal CdSe/ZnS quantum dot. However, colloidal quantum dots exhibit inherent photo-bleaching. Thus, it is desired to couple an NFBC with hexagonal boron nitride (hBN) as stable quantum emitters. In this work, we realize a hybrid system of an NFBC and ensemble defect centres in hBN nanoflakes. In this experiment, we fabricate NFBCs with a quality factor of 807 and a resonant wavelength at around 573 nm, which matches well with the fluorescent wavelength of the hBN, using helium-focused ion beam (FIB) system. We also develop a manipulation system to place hBN nanoflakes on a cavity region of the NFBCs and realize a hybrid device with an NFBC. By exciting the nanoflakes via an objective lens and collecting the fluorescence through the NFBC, we observe a sharp emission peak at the resonant wavelength of the NFBC.
Organisation(s): QuantumFrontiers
Institute of Solid State Physics
External Organisation(s): Kyoto University
National Metrology Institute of Germany (PTB)
UTS University of Technology Sydney
Type: Article
Journal: Scientific reports
Volume: 12
ISSN: 2045-2322
Publication date: 07.01.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General
Electronic version(s): https://doi.org/10.1038/s41598-021-03703-z (Access: Open)

BibTeX

@article{f20196b7ab7046ff9b7eb9ef28c1ef25,
title = "Hybrid device of hexagonal boron nitride nanoflakes with defect centres and a nano-fibre Bragg cavity",
abstract = "Solid-state quantum emitters coupled with a single mode fibre are of interest for photonic and quantum applications. In this context, nanofibre Bragg cavities (NFBCs), which are microcavities fabricated in an optical nanofibre, are promising devices because they can efficiently couple photons emitted from the quantum emitters to the single mode fibre. Recently, we have realized a hybrid device of an NFBC and a single colloidal CdSe/ZnS quantum dot. However, colloidal quantum dots exhibit inherent photo-bleaching. Thus, it is desired to couple an NFBC with hexagonal boron nitride (hBN) as stable quantum emitters. In this work, we realize a hybrid system of an NFBC and ensemble defect centres in hBN nanoflakes. In this experiment, we fabricate NFBCs with a quality factor of 807 and a resonant wavelength at around 573 nm, which matches well with the fluorescent wavelength of the hBN, using helium-focused ion beam (FIB) system. We also develop a manipulation system to place hBN nanoflakes on a cavity region of the NFBCs and realize a hybrid device with an NFBC. By exciting the nanoflakes via an objective lens and collecting the fluorescence through the NFBC, we observe a sharp emission peak at the resonant wavelength of the NFBC.",
author = "Toshiyuki Tashima and Hideaki Takashima and Schell, {Andreas W.} and Tran, {Toan Trong} and Igor Aharonovich and Shigeki Takeuchi",
note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research (21H04444, 26220712, 19K03700, 19K03686), the MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) (JPMXS0118067634), the CREST program of the Japan Science and Technology Agency (JST) (JPMJCR1674), and the Nanotechnology Platform of MEXT (JPMXP09F20OS0018, JPMXP09F21OS0024). The authors wish to thank the Australian Research Council (CE200100010) for financial support. A. W. S. was supported by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy - EXC-2123 Quantum Frontiers - 390837967. ",
year = "2022",
month = jan,
day = "7",
doi = "10.1038/s41598-021-03703-z",
language = "English",
volume = "12",
journal = "Scientific reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",
}