Thermo-optical resonance locking of an optically trapped salt-water microdroplet

Marc Guillon*, Rachael E.H. Miles, Jonathan P. Reid, David McGloin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We demonstrate that it is possible to lock the radius of an optically trapped salt-water microdroplet to the n = 1 whispering gallery resonances (WGRs) at the trapping laser wavelength. The optical properties of the droplet are determined using stimulated Raman scattering. The droplet is in thermodynamic equilibrium with the surrounding vapour and the proposed locking mechanism consists of a balance between bulk heating and WGR heating. Raman measurements allow the size parameter (nka) of the droplet to be determined with a precision of ∼10-5and the resonance linewidth to be estimated.

Original languageEnglish
Article number103041
Number of pages11
JournalNew Journal of Physics
Publication statusPublished - 26 Oct 2009

Bibliographical note

Acknowledgements: MG acknowledges the University of Dundee for financial support. DM is a Royal Society
University Research Fellow. REHM and JPR acknowledge Dr Laura Mitchem for preliminary
measurements that contributed to this work. The authors also acknowledge the EPSRC for
financial support for this research and for Leader Fellowship funding for JPR. The authors are
finally grateful to Dr Knox for helpful and stimulating discussions.


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