Abstract

A systematic study on the effects of microtaper fiber diameters on the spectral characteristics of a whispering-gallery-mode (WGM) microbottle resonator (MBR) is presented. Progressively cleaner and simpler spectra of the MBR were observed when the utilized microtaper fiber waist diameter ($D_t$) was increased from 2 to 10 μm. The maximum transmission depth at resonance varies with different microtaper fiber utilized from $\sim 20\mathrm{dB}$ ($D_t=2\mathrm{\mu m}$) to $\sim 4\mathrm{dB}$ ($D_t=10\mathrm{\mu m}$). The loaded $Q$-factors were observed to be unaffected by the increase of $D_t$ with values of $>{10}^6$ being measured in all cases. Mode transformation of MBR was also experimentally investigated and compared to a microdisc finite-difference time-domain simulation by studying near-field images of the output beam on the waist of the microtaper fibers. For the first time, experimental observation of mode transformation from ${\mathrm{LP}}_{01}$ to ${\mathrm{LP}}_{11}$ across scanned WGM resonances is being reported.

© 2016 Optical Society of America

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