Hybrid High Q hexagonal Boron Nitride microresonators
Committee MemberSanders, Barry
Whispering gallery mode resonators
Chemical vapor deposition
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Abstract2D van der Waals materials have been explored widely for their applications in electronic, photonic, and energy harvesting devices due to the amount of tunability they offer in physical properties, based on the number of layers grown. One such material is hexagonal Boron Nitride (hBN) which possesses a wide electronic bandgap (~ 6 eV). It's being explored by research groups worldwide for its use in emerging platforms for quantum optics and nanophotonics applications, by fabricating optical microresonators making use of hBN as the sole or one of the constituent materials. Previous efforts gave rise to devices possessing a peak optical quality factor of ~ 2000, promising a further scope of improvement in this figure-of-merit in the future. In this work, hybrid hBN-silica whispering gallery mode (WGM) optical resonators that exhibit high optical quality factors (~ 500,000) are studied experimentally. The effect of hBN thickness and microdisk dimensions are investigated to estimate a linear optical absorption coefficient of hBN. The high quality factor offered by these devices will prove useful for applications in the eld of nanophotonics, quantum optics, and non-linear optics. The devices' hybrid composition also allows us to probe into the various loss mechanisms associated with hBN itself and estimate a linear optical absorption of 9.5 /cm associated with the material.
CitationDas, A. (2022). Hybrid High Q hexagonal Boron Nitride microresonators (Unpublished master's thesis). University of Calgary, Calgary, AB.
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