We demonstrate the fabrication of surface nanoscale axial photonics bottle microresonators with angstrom precision using a flame. We observe strongly unscalable behavior of the whispering gallery mode cutoff wavelengths with different radial quantum numbers along the fibre length.
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Funding: The authors acknowledge funding from Engineering and
Physical Sciences Research Council (EPSRC) under Grant
EP/P006183/1 and from Horizon 2020 under MSCA-ITN-EID
- cutoff wavelength
- optical microresonators
- whispering gallery modes