Coupling spin defects in hexagonal boron nitride to titanium dioxide ring resonators

Milad Nonahal; Chi Li; Febiana Tjiptoharsono; Lu Ding; Connor Stewart; John Scott; Milos Toth; Son Tung Ha; Mehran Kianinia; Igor Aharonovich

doi:10.1039/d2nr02522a

Coupling spin defects in hexagonal boron nitride to titanium dioxide ring resonators

Nanoscale. 2022 Oct 21;14(40):14950-14955. doi: 10.1039/d2nr02522a.

Authors

Milad Nonahal¹, Chi Li^{1

2}, Febiana Tjiptoharsono³, Lu Ding³, Connor Stewart¹, John Scott^{1

2}, Milos Toth^{1

2}, Son Tung Ha³, Mehran Kianinia^{1

2}, Igor Aharonovich^{1

2}

Affiliations

¹ School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Ultimo, New South Wales 2007, Australia. igor.aharonovich@uts.edu.au.
² ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), University of Technology Sydney, Ultimo, New South Wales 2007, Australia.
³ Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Kinesis, 138635 Singapore.

PMID: 36069362
DOI: 10.1039/d2nr02522a

Abstract

Spin-dependent optical transitions are attractive for a plethora of applications in quantum technologies. Here we report on utilization of high quality ring resonators fabricated from TiO₂ to enhance the emission from negatively charged boron vacancies (V_B^-) in hexagonal Boron Nitride. We show that the emission from these defects can efficiently couple into the whispering gallery modes of the ring resonators. Optically coupled V_B^- showed photoluminescence contrast in optically detected magnetic resonance signals from the hybrid coupled devices. Our results demonstrate a practical method for integration of spin defects in 2D materials with dielectric resonators which is a promising platform for quantum technologies.