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Lookup NU author(s): Dr Ahmet Avsar
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Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over deterministic spatial positioning of emitters in hBN remained elusive for a long time, limiting their proper correlative characterization and applications in hybrid devices. Recently, focused ion beam (FIB) systems proved to be useful to engineer several types of spatially defined emitters with various structural and photophysical properties. Here we systematically explore the physical processes leading to the creation of optically active defects in hBN using FIB and find that beam−substrate interaction plays a key role in the formation of defects. These findings are confirmed using transmission electron microscopy, which reveals local mechanical deterioration of the hBN layers and local amorphization of ion beam irradiated hBN. Additionally, we show that, upon exposure to water, amorphized hBN undergoes a structural and optical transition between two defect types with distinctive emission properties. Moreover, using super-resolution optical microscopy combined with atomic force microscopy, we pinpoint the exact location of emitters within the defect sites, confirming the role of defected edges as primary sources of fluorescent emission. This lays the foundation for FIB-assisted engineering of optically active defects in hBN with hig
Author(s): Glushkov E, Macha M, Räth E, Navikas V, Ronceray N, Cheon C, Ahmed A, Avsar A, Watanabe K, Taniguchi T, Shorubalko I, Kis A, Fantner G, Radenovic A
Publication type: Article
Publication status: Published
Journal: ACS Nano
Year: 2022
Volume: 16
Issue: 3
Pages: 3695–3703
Print publication date: 07/03/2022
Online publication date: 07/03/2022
Acceptance date: 22/02/2022
ISSN (print): 1936-0851
ISSN (electronic): 1936-086X
Publisher: American Chemical Society
URL: https://doi.org/10.1021/acsnano.1c07086
DOI: 10.1021/acsnano.1c07086
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