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

• Published in: Sensors (Basel, Switzerland) Vol. 16; no. 9; p. 1405
• Main Authors: Cosci, Alessandro, Berneschi, Simone, Giannetti, Ambra, Farnesi, Daniele, Cosi, Franco, Baldini, Francesco, Nunzi Conti, Gualtiero, Soria, Silvia, Barucci, Andrea, Righini, Giancarlo, Pelli, Stefano
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 31.08.2016; MDPI
• Subjects: Electrodes; Experiments; Fluctuation; fluctuations; Holes; microresonators; Noise; Polymethyl methacrylates; Pumping; Pumps; Resonators; Sensors; Stability; stabilization; Syringes; whispering gallery modes; microresonators; stabilization; fluctuations; stability; whispering gallery modes
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s16091405

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.