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Resonance Frequency of Optical Microbubble Resonators: Direct Measurements and Mitigation of Fluctuations

Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale 1, Rome 00184, Italy
IFAC-CNR, Istituto di Fisica Applicata “Nello Carrara”, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, Sesto Fiorentino 50019, Italy
Author to whom correspondence should be addressed.
Academic Editor: Galina Nemova
Sensors 2016, 16(9), 1405;
Received: 22 July 2016 / Revised: 23 August 2016 / Accepted: 29 August 2016 / Published: 31 August 2016
(This article belongs to the Special Issue SPR, WGM & Nano-Sensors: Advantages and Prospects)
PDF [1829 KB, uploaded 31 August 2016]


This work shows the improvements in the sensing capabilities and precision of an Optical Microbubble Resonator due to the introduction of an encaging poly(methyl methacrylate) (PMMA) box. A frequency fluctuation parameter σ was defined as a score of resonance stability and was evaluated in the presence and absence of the encaging system and in the case of air- or water-filling of the cavity. Furthermore, the noise interference introduced by the peristaltic and the syringe pumping system was studied. The measurements showed a reduction of σ in the presence of the encaging PMMA box and when the syringe pump was used as flowing system. View Full-Text
Keywords: microresonators; whispering gallery modes; stability; fluctuations; stabilization microresonators; whispering gallery modes; stability; fluctuations; stabilization

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Cosci, A.; Berneschi, S.; Giannetti, A.; Farnesi, D.; Cosi, F.; Baldini, F.; Nunzi Conti, G.; Soria, S.; Barucci, A.; Righini, G.; Pelli, S. Resonance Frequency of Optical Microbubble Resonators: Direct Measurements and Mitigation of Fluctuations. Sensors 2016, 16, 1405.

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