High Q-factor reconfigurable microresonators induced in side-coupled optical fibres

Victor Vassiliev, Misha Sumetsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


High Q-factor monolithic optical microresonators found numerous applications in classical and quantum optical signal processing, microwave photonics, ultraprecise sensing, as well as fundamental optical and physical sciences. However, due to the solid structure of these microresonators, attaining the free spectral range tunability of most of them, critical for several of these applications, was, so far, unfeasible. To address this problem, here we experimentally demonstrate that the side-coupling of coplanar bent optical fibres can induce a high Q-factor whispering gallery mode optical microresonator. By changing the curvature radius of fibres from the centimetre order to the millimetre order, we demonstrate fully mechanically reconfigurable optical microresonators with dimensions varying from the millimetre order to 100-micron order and free spectral range varying from a picometre to ten picometre order. The developed theory describes the formation of the discovered microresonators and their major properties in a reasonable agreement with the experimental data. The new microresonators may find applications in cavity QED, microresonator optomechanics, frequency comb generation with tuneable repetition rate, tuneable lasing, and tuneable processing and delay of optical pulses.

Original languageEnglish
Article number197
JournalLight: Science & Applications
Issue number1
Publication statusPublished - 18 Aug 2023

Bibliographical note

Funding Information:
The work on the paper was supported by the Engineering and Physical Sciences Research Council (EPSRC) (grants EP/P006183/1 and EP/W002868/1), Horizon 2020 MSCA-ITN-EID (grant 814147), and Leverhulme Trust (grant RPG-2022-014).

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.


Dive into the research topics of 'High Q-factor reconfigurable microresonators induced in side-coupled optical fibres'. Together they form a unique fingerprint.

Cite this