A single-input whispering gallery optical microbubble resonator is presented. Spherical microbubbles with diam eters less than , micrometer-sized wall thicknesses, and a single opening or input were fabricated by heating the tapered tip of a pressurized glass capillary using a laser. Optical whispering gallery modes with Q factors of were obtained. The bubbles were filled with water and mode shifts of were observed. Fano-type resonances were detected when the coupling optical fiber diameter was less than , causing the microresonator to switch from being a band-stop filter to a bandpass filter. Larger bubbles with submicrometer wall thickness were also fabricated.
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