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説明:

Crystal defects in hexagonal boron nitride (hBN), are emerging as versatile nanoscale optical probes with a wide application profile, spanning the fields of nanophotonics, biosensing, bioimaging and quantum information processing. However, generating these crystal defects as reliable optical emitters remains challenging due to the need for deterministic defect placement and precise control of the emission area. Here, we demonstrate an approach that integrates microspheres (MS) with hBN optical probes to enhance both defect generation and optical signal readout. This technique harnesses MS to amplify light-matter interactions at the nanoscale through two mechanisms: focused femtosecond (fs) laser irradiation into a photonic nanojet for highly localized defect generation, and enhanced light collection via the whispering gallery mode effect. Our MS-assisted defect generation method reduces the emission area by a factor of 5 and increases the fluorescence collection efficiency by approximately 10 times compared to MS-free samples. These advancements in defect generation precision and signal collection efficiency open new possibilities for optical emitter manipulation in hBN, with potential applications in quantum technologies and nanoscale sensing.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: hexagonal boron nitride, microsphere, laser fabrication

刊行年月日: 2025-06-05

出版者: Wiley

掲載誌:

• Nanophotonics (ISSN: 21928614) vol. 14 issue. 14 p. 2419-2430

研究助成金:

• H2020 European Research Council 101041486

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1515/nanoph-2024-0625

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更新時刻: 2026-04-03 13:04:39 +0900

MDRでの公開時刻: 2026-04-03 16:27:43 +0900