Abstract

A single-input whispering gallery optical microbubble resonator is presented. Spherical microbubbles with diam eters less than 100μm, micrometer-sized wall thicknesses, and a single opening or input were fabricated by heating the tapered tip of a pressurized glass capillary using a CO2 laser. Optical whispering gallery modes with Q factors of 105 were obtained. The bubbles were filled with water and mode shifts of 20GHz were observed. Fano-type resonances were detected when the coupling optical fiber diameter was less than 1μm, causing the microresonator to switch from being a band-stop filter to a bandpass filter. Larger bubbles with submicrometer wall thickness were also fabricated.

© 2011 Optical Society of America

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