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 ; Ming Ding ; G. Senthil Murugan and Michalis N. Zervas
Microtaper fiber excitation effects in bottle microresonators
", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 860020 (March 12, 2013); doi:10.1117/12.2004282; http://dx.doi.org/10.1117/12.2004282