12 March 2013 Microtaper fiber excitation effects in bottle microresonators
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We have carried out a systematic study of the effect of microtaper diameter on the spectral characteristics of bottle microresonators. By increasing the microtaper-diameter (Dt) from 2μm to 10μm results in progressively cleaner spectra. The transmission depth at resonance varies from ~15dB (@Dt=2μm) to >3dB (@Dt=10μm). The loaded Q factors were measured to be >10+6 in all cases. However, with microtaper Dt=10μm clearly-resolved single resonance peaks could be observed and free-spectral ranges could be easily identified. At some transmission resonances, we have observed LP01→LP11 mode transformation at the excitation microtaper waist, for the first time, as the resonance is scanned.
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M. Narizee Mohd Nasir, M. Narizee Mohd Nasir, Ming Ding, Ming Ding, G. Senthil Murugan, G. Senthil Murugan, Michalis N. Zervas, Michalis N. Zervas, "Microtaper fiber excitation effects in bottle microresonators", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 860020 (12 March 2013); doi: 10.1117/12.2004282; https://doi.org/10.1117/12.2004282

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