Hexagonal boron nitride (hBN) is a wide bandgap van der Waals material that is emerging as a powerful platform for quantum optics and nanophotonics. In this work, we demonstrate whispering gallery mode silica microresonators hybridized with thin layers of hBN that exhibit high intrinsic optical quality factor >7 × 105 and a linear absorption coefficient of 9.5 cm-1. Measurements of the effect of hBN thickness on optical Q and comparison with a theoretical model allows the linear optical absorption coefficient of the hBN films to be estimated. These high-Q devices will be useful for applications in quantum and nonlinear optics, and their hybridized geometry provides a sensitive platform for evaluating losses in hBN and other 2D materials.
Bibliographical noteFunding Information:
This work was supported by the Alberta Innovates Strategic Research Projects Program (G2018000888), the Canada Foundation for Innovation (CGI Project 36130), the National Research Council Nanotechnology Research Centre, and the NSERC Discovery Grant (RGPIN/04535-2016), Accelerator, CREATE, Strategic Partnership Grant (STPGP/521536-2018), and RTI Programs. Prof. Igor Aharanovich acknowledges support from the Australian Research Council (CE200100010) and the Asian Office of Aerospace Research and Development (FA2386-20-1-4014). J.P. gratefully acknowledges the financial support from both the KIST Institutional Program (under Contract No. 2E31181) and the Ministry of Science and ICT, Midcareer Researcher Program (under Contract No. NRF2017R1A2B2008115).
© 2021 American Chemical Society.
- 2D material
- chemical vapor deposition
- hybrid devices
- optical absorption
- whispering gallery mode
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering