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Updated: Oct 27, 2025
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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Coupling Spin Defects in Hexagonal Boron Nitride to Monolithic Bullseye Cavities
Johannes E Fröch1, Lesley P Spencer1,2, Mehran Kianinia1,2
1School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.
Nano Letters
|July 21, 2021
Summary
Spin defects in hexagonal boron nitride (hBN) were coupled to bullseye cavities, enhancing light emission by 6.5-fold. This research advances quantum photonic applications using hBN spin defects for scalable spin-photon interfaces.
Area of Science:
- Quantum photonics
- Materials science
- Solid-state physics
Background:
- Color centers in hexagonal boron nitride (hBN) are crucial for quantum photonic applications.
- Spin defects in hBN offer promising properties for quantum technologies.
Purpose of the Study:
- To demonstrate efficient coupling of hBN spin defects to bullseye cavities.
- To investigate the enhancement of spin defect emission and optical properties.
- To determine the emission dipole orientation of hBN spin defects.
Main Methods:
- Experimental coupling of boron vacancy spin defects to monolithic hBN bullseye cavities.
- Finite-difference time-domain (FDTD) modeling for optical simulations.
- Optically detected magnetic resonance (ODMR) for readout enhancement analysis.
Main Results:
- A 6.5-fold enhancement in emission from coupled boron vacancy spin defects.
- Determination of emission dipole orientation through comparative FDTD modeling.
- Improved contrast and signal-to-noise ratio in ODMR readout of the coupled system.
Conclusions:
- Efficient coupling of hBN spin defects to photonic resonators is achievable.
- Simulations support experimental findings and provide insights into optical properties.
- This work is a foundational step towards scalable spin-photon interfaces using hBN.
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