Discovery of parabolic SNAP microresonators produced in fibre tapering

Gabriella Gardosi*, Sajid Zaki, Dashiell L.P. Vitullo, Kirill Tokmakov, Michael Brodsky, Misha Sumetsky

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication


We present a novel method based on optical fibre tapering for fabrication of Surface Nanoscale Axial Photonics (SNAP) devices with parabolic profiles with an unprecedentedly large number of axial eigenmodes. Tapering of a commercial 125 μm single-mode optical fibre to a 30 μm diameter waist by laser brushing creates a SNAP bottle microresonator with parabolic radius variation in the centre of the tapered region. Ideal parabolic resonators should demonstrate equal spacing between resonances. Our spectral measurement of the parabolic profile shows spacing of ∼6 GHz with 10% deviation over a bandwidth of 2.5 THz containing up to 400 axial eigenfrequencies. This new discovery for the creation of SNAP parabolic microresonator devices is important for fabrication of miniature delay lines, buffers and frequency comb generators. Characterisation of our exemplar microresonators is briefly explored, particularly for broadband frequency comb generators which require equidistant frequency spacing. Further investigations include scaling of the parabolic feature with tapering process parameters, repeatability testing, and the fabrication of more complex shapes.

Original languageEnglish
Title of host publicationMicro-Structured and Specialty Optical Fibres V
ISBN (Electronic)9781510618886
Publication statusPublished - 9 May 2018
EventMicro-Structured and Specialty Optical Fibres V 2018 - Strasbourg, France
Duration: 25 Apr 201826 Apr 2018

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceMicro-Structured and Specialty Optical Fibres V 2018

Bibliographical note

Copyright 2018 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • bottle resonator
  • frequency comb generation
  • harmonic potential
  • parabolic profile
  • Surface Nanoscale Axial Photonics
  • taper
  • Whispering gallery mode


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