Tashima Toshiyuki, Takashima Hideaki, Schell Andreas W, Tran Toan Trong, Aharonovich Igor, Takeuchi Shigeki
Department of Electronic Science and Engineering, Kyoto University, Kyoto, 615-8510, Japan.
Faculty of Mathematics and Physics, Leibniz University Hannover, 30167, Hannover, Germany.
Sci Rep. 2022 Jan 7;12(1):96. doi: 10.1038/s41598-021-03703-z.
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.
与单模光纤耦合的固态量子发射器在光子和量子应用中备受关注。在这种情况下，纳米纤维布拉格腔（NFBCs）是在光学纳米纤维中制造的微腔，是很有前景的器件，因为它们可以将量子发射器发射的光子有效地耦合到单模光纤。最近，我们实现了一个NFBC与单个胶体CdSe/ZnS量子点的混合器件。然而，胶体量子点存在固有的光漂白现象。因此，期望将NFBC与作为稳定量子发射器的六方氮化硼（hBN）耦合。在这项工作中，我们实现了一个NFBC与hBN纳米薄片中的整体缺陷中心的混合系统。在这个实验中，我们使用氦聚焦离子束（FIB）系统制造了品质因数为807且共振波长在573nm左右的NFBC，该波长与hBN的荧光波长匹配良好。我们还开发了一个操纵系统，将hBN纳米薄片放置在NFBC的腔区域上，并实现了一个带有NFBC的混合器件。通过经由物镜激发纳米薄片并通过NFBC收集荧光，我们在NFBC的共振波长处观察到一个尖锐的发射峰。
