We report the fabrication and optical characterization of spherical whispering gallery mode(WGM)resonators made from ultraviolet(UV)-curable adhesive.The fabricated microspheres have good sphericity and surface smoothness,and can directly adhere to the tip of half-tapered fibers for easy manipulation.WGMs are e?ciently excited in the microsphere using an evanescent field of the tapered silica optical fibers.Resonances with quality factors of 1.3×105are observed.The dependence of wavelength shifts of WGM resonances on the input light powers shows that the resonant wavelength of the proposed microsphere resonators can be tuned thermo-optically.
