Localization of light in an optical microcapillary introduced by a droplet

Tabassom Hamidfar, Kirill V. Tokmakov, Brian J. Mangan, Robert S. Windeler, Artemiy V. Dmitriev, Dashiell L.P. Vitullo, Pablo Bianucci, Misha Sumetsky

Research output: Contribution to journalArticle

Abstract

Sensing with optical whispering gallery modes (WGMs) is a rapidly developing detection method in modern microfluidics research. This method explores the perturbations of spectra of WGMs propagating along the wall of an optical microcapillary to characterize the liquid medium inside it. Here we show that WGMs in a silica microcapillary can be fully localized (rather than perturbed) by evanescent coupling to a water droplet and, thus, form a high-quality-factor microresonator. The spectra of this resonator, measured with a microfiber translated along the capillary, present a hierarchy of resonances that allow us to determine the size of the droplet and variation of its length due to the evaporation. The resolution of our measurements of this variation equal to 4.5 nm is only limited by the resolution of the optical spectrum analyzer used. The discovered phenomenon of complete localization of light in liquid-filled optical microcapillaries suggests a new type of microfluidic photonic device as well as an ultraprecise method for microfluidic characterization.

LanguageEnglish
Pages382-388
Number of pages7
JournalOptica
Volume5
Issue number4
DOIs
Publication statusPublished - 29 Mar 2018

Fingerprint

Whispering gallery modes
whispering gallery modes
Microfluidics
microfibers
Spectrum analyzers
Photonic devices
Liquids
liquids
Silicon Dioxide
hierarchies
optical spectrum
Q factors
Resonators
analyzers
Evaporation
resonators
Silica
evaporation
photonics
silicon dioxide

Bibliographical note

© 2018 OSA. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must
maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Funding: Horizon 2020 Framework Programme (H2020) (H2020‐EU.1.3.3, 691011), Engineering and Physical Sciences Research Council (EPSRC) (EP/P006183/1).

Cite this

Hamidfar, T., Tokmakov, K. V., Mangan, B. J., Windeler, R. S., Dmitriev, A. V., Vitullo, D. L. P., ... Sumetsky, M. (2018). Localization of light in an optical microcapillary introduced by a droplet. 5(4), 382-388. https://doi.org/10.1364/OPTICA.5.000382
Hamidfar, Tabassom ; Tokmakov, Kirill V. ; Mangan, Brian J. ; Windeler, Robert S. ; Dmitriev, Artemiy V. ; Vitullo, Dashiell L.P. ; Bianucci, Pablo ; Sumetsky, Misha. / Localization of light in an optical microcapillary introduced by a droplet. 2018 ; Vol. 5, No. 4. pp. 382-388.
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Hamidfar, T, Tokmakov, KV, Mangan, BJ, Windeler, RS, Dmitriev, AV, Vitullo, DLP, Bianucci, P & Sumetsky, M 2018, 'Localization of light in an optical microcapillary introduced by a droplet' vol. 5, no. 4, pp. 382-388. https://doi.org/10.1364/OPTICA.5.000382

Localization of light in an optical microcapillary introduced by a droplet. / Hamidfar, Tabassom; Tokmakov, Kirill V.; Mangan, Brian J.; Windeler, Robert S.; Dmitriev, Artemiy V.; Vitullo, Dashiell L.P.; Bianucci, Pablo; Sumetsky, Misha.

Vol. 5, No. 4, 29.03.2018, p. 382-388.

Research output: Contribution to journalArticle

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Hamidfar T, Tokmakov KV, Mangan BJ, Windeler RS, Dmitriev AV, Vitullo DLP et al. Localization of light in an optical microcapillary introduced by a droplet. 2018 Mar 29;5(4):382-388. https://doi.org/10.1364/OPTICA.5.000382