Abstract
Fluorescence decay rate enhancement of rhodamine 6G (R6G) in levitated ethylene glycol microdroplets (4–8 μm diam.) has been observed. This effect derives from an increase (relative to extended media) in electromagnetic mode density near resonance frequencies associated with the droplet. Unlike bulk solutions, fluorescence lifetimes ( T 1) in microcavities carry information on electronic polarization dephasing ( T 2) on a femtosecond time scale. Thus, femtosecond dynamics can be probed indirectly via fluorescence with a time resolution of several picoseconds. The value of T 2 in ethylene glycol estimated from our measurements agrees well with values obtained from direct femtosecond probes.
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