Abstract

We fabricated optical microfiber knot resonators from thin tapered fibers (diameter down to 1μm) linked to untapered fiber at both ends. We demonstrated a finesse of about 100, over twice as high as previously reported for microfiber resonators. Low-loss encapsulation of microfiber knot resonators in hydrophobic silica aerogel was also investigated.

© 2011 Optical Society of America

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