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Enhanced emission from hBN in sputtered microcavities.

K G Scheuer, P S Kirwin, G J Hornig

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    |September 14, 2023
    PubMed
    Summary

    Few-layer hexagonal boron nitride (hBN) embedded in a Fabry-Perot cavity maintains its luminescence after deposition. Annealing causes edge-glowing cracks, informing future hBN integration.

    Area of Science:

    • Materials Science
    • Optics
    • Solid State Physics

    Background:

    • Few-layer hexagonal boron nitride (hBN) is a material with unique luminescent properties.
    • Integrating hBN into optical cavities can enhance its light-emitting characteristics.
    • Energetic deposition methods can potentially damage delicate material properties.

    Purpose of the Study:

    • To investigate the luminescent properties of few-layer hBN embedded within a planar Fabry-Perot cavity.
    • To assess the impact of pulsed DC magnetron sputtering deposition on hBN's optical characteristics.
    • To explore the effects of post-deposition annealing on the integrated hBN.

    Main Methods:

    • Fabrication of a planar Fabry-Perot cavity using pulsed DC magnetron sputtering.
    • Embedding few-layer hexagonal boron nitride (hBN) within the cavity structure.

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  • Optical characterization of the hBN's luminescence before and after deposition and annealing.
  • Analysis of surface-normal emission enhancement and material morphology.

    • Main Results:

    • Few-layer hBN retained its visible range, defect-based luminescence after energetic deposition.
    • An emission enhancement factor of approximately 40 was observed, aligning with theoretical predictions.
    • Rapid thermal annealing induced a cracking effect in the embedded hBN, with glowing edges.

    Conclusions:

    • Monolithic integration of hBN within optical cavities is feasible while preserving its luminescent properties.
    • The observed enhancement factor validates the cavity design for hBN.
    • Annealing-induced cracking and localized luminescence offer insights for advanced device engineering with hBN.