Abstract
Ultra-high-Q optical microcavities provide one method for distinguishing chemically similar species. Resonators immersed in have lower quality factors than those immersed in due to the difference in optical absorption. This difference can be used to create a detector. This effect is most noticeable at , where the is and the is . By monitoring Q, concentrations of [1 part in per volume] of in have been detected. This sensitivity represents an order of magnitude improvement over previous techniques. Reversible detection was also demonstrated by cyclic introduction and flushing of .
© 2006 Optical Society of America
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