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Selective excitation of spheroidal whispering gallery modes and bottle modes in a robust bottle microresonator fabricated straightforwardly from a short section of optical fiber is demonstrated. Characteristic resonance spectra of long-cavity bottle modes were obtained by using a tapered fiber to excite evanescently bottle microresonator at different points along its axis. Compared to bare-fiber cylindrical resonators, the bottle microresonator results in a 35x increase of the observed Q factor.

The propulsion of $3\mu \mathrm{m}$ polystyrene spheres along a subwavelength optical wire is demonstrated. Velocities in the range of $7–15\mu \mathrm{m}∕\mathrm{s}$ are observed. Simulations are carried out to evaluate the evanescent field at the waveguide–water suspension interface.