Coherent suppression of backscattering in optical microresonators

Andreas Ø. Svela; Jonathan M. Silver; Leonardo Del Bino; Shuangyou Zhang; Michael T. M. Woodley; Michael R. Vanner; Pascal Del'Haye

doi:10.1038/s41377-020-00440-2

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Coherent suppression of backscattering in optical microresonators

Original Articles

- Coherent suppression of backscattering in optical microresonators
- Light: Science & Applications Vol. 9, Issue 6, Pages: 2035-2042(2020)
- Affiliations：
  
  1.National Physical Laboratory, Teddington TW11 0LW, UK
  2.Blackett Laboratory, Imperial College London, London SW7 2AZ, UK
  3.Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK
  4.City University of London, London EC1V 0HB, UK
  5.Max Planck Institute for the Science of Light, Staudtstaße 2, 91058 Erlangen, Germany
  6.Heriot-Watt University, Edinburgh EH14 4AS, UK
  7.Friedrich Alexander University Erlangen-Nuremberg, 91058 Erlangen, Germany
- Author bio：
  
  Andreas Ø. Svela (asvela@ic.ac.uk)
  Pascal Del'Haye (pascal.delhaye@mpl.mpg.de)
- Funds：
- DOI：10.1038/s41377-020-00440-2
  CLC：
- Published：2020，
  
  Published Online：23 December 2020，
  
  Received：03 April 2020，
  
  Revised：03 November 2020，
  
  Accepted：19 November 2020
- Accepted：
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Svela, A. Ø. et al. Coherent suppression of backscattering in optical microresonators. Light: Science & Applications, 9, 2035-2042 (2020).
DOI：

Svela, A. Ø. et al. Coherent suppression of backscattering in optical microresonators. Light: Science & Applications, 9, 2035-2042 (2020). DOI： 10.1038/s41377-020-00440-2.

摘要

Abstract

As light propagates along a waveguide

a fraction of the field can be reflected by Rayleigh scatterers. In high-quality-factor whispering-gallery-mode microresonators

this intrinsic backscattering is primarily caused by either surface or bulk material imperfections. For several types of microresonator-based experiments and applications

minimal backscattering in the cavity is of critical importance

and thus

the ability to suppress backscattering is essential. We demonstrate that the introduction of an additional scatterer into the near field of a high-quality-factor microresonator can coherently suppress the amount of backscattering in the microresonator by more than 30 dB. The method relies on controlling the scatterer position such that the intrinsic and scatterer-induced backpropagating fields destructively interfere. This technique is useful in microresonator applications where backscattering is currently limiting the performance of devices

such as ring-laser gyroscopes and dual frequency combs

which both suffer from injection locking. Moreover

these findings are of interest for integrated photonic circuits in which back reflections could negatively impact the stability of laser sources or other components.

关键词

Keywords

references

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