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.
['Alessandro Cosci', 'S. Berneschi', 'A. Giannetti', 'D. Farnesi', 'F. Cosi', 'Francesco Baldini', 'Gualtiero Nunzi Conti', 'Silvia Soria', 'A. Barucci', 'Giancarlo C. Righini', 'S. Pelli']
Resonance Frequency of Optical Microbubble Resonators: Direct Measurements and Mitigation of Fluctuations