Emitter–optomechanical interaction in ultrahigh-Q hBN nanocavities

A spectral anomaly exhibiting pronounced asymmetry is observed in the emission spectrum for nanocavities when they are pumped by the charged boron vacancy VB− and have a high Q-factor above a threshold of 10 000. In contrast, cavities without VB− centers always exhibit trivial Lorentzian emission. These observations are well explained by the feature of VB− that its light–matter interaction is induced by local phonon modes. Moreover, we find that in nanocavities the local phonon modes arise from the coupling between VB− lattice phonons and cavity mechanical modes, supported by the spatially resolved spectroscopy of VB− and resonant spectroscopy of the cavity photonic mode. Our results reveal a novel system involving the coupling in both the photonic and phononic degrees of freedom between the active material and the nanocavity. Such an emitter–optomechanical interaction system shows great potential in non-trivial quantum photonic devices and provides a platform to interface spin defects, photons, and phonons.

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Publication Details

Journal
APL Quantum
Published
2025-04-25
DOI
https://doi.org/10.1063/5.0267881
Primary Topic
Mechanical and Optical Resonators
Type
article
Field-Weighted Citation Impact
0.00

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article

Emitter–optomechanical interaction in ultrahigh-Q hBN nanocavities

Andreas V. Stier, Ulrich Kentsch, Chenjiang Qian, Martin Schalk et al.
APL Quantum
Mechanical and Optical Resonators
article

Emitter–optomechanical interaction in ultrahigh-Q hBN nanocavities

Andreas V. Stier, Ulrich Kentsch, Chenjiang Qian, Martin Schalk, M. Helm, G. V. Astakhov, Viviana Villafañe, Jonathan J. Finley, Pedro Soubelet
article en

Abstract

A spectral anomaly exhibiting pronounced asymmetry is observed in the emission spectrum for nanocavities when they are pumped by the charged boron vacancy VB− and have a high Q-factor above a threshold of 10 000. In contrast, cavities without VB− centers always exhibit trivial Lorentzian emission. These observations are well explained by the feature of VB− that its light–matter interaction is induced by local phonon modes. Moreover, we find that in nanocavities the local phonon modes arise from the coupling between VB− lattice phonons and cavity mechanical modes, supported by the spatially resolved spectroscopy of VB− and resonant spectroscopy of the cavity photonic mode. Our results reveal a novel system involving the coupling in both the photonic and phononic degrees of freedom between the active material and the nanocavity. Such an emitter–optomechanical interaction system shows great potential in non-trivial quantum photonic devices and provides a platform to interface spin defects, photons, and phonons.

APL QuantumVol. 2(2)
Schott (Germany) (DE), Chinese Academy of Sciences (CN), Helmholtz-Zentrum Dresden-Rossendorf (DE), Physical Sciences (United States) (US), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), University of Chinese Academy of Sciences (CN), Technical University of Munich (DE)
Alexander von Humboldt-Stiftung, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, Munich Center for Quantum Science and Technology
Openalex Percentile: Top 93%
Mechanical and Optical Resonators
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