Cavity-QED enhancement of fluorescence yields in microdroplets
- Oak Ridge National Lab., TN (United States). Analytical Chemistry Div.
Measurements of the integrated fluorescence yield of Rhodamine 6G (R6G) in levitated microdroplets (4 to 16 {mu}m diameter) display a size dependence which is attributed to a decreased probability per excitation cycle of photochemical bleaching as a result of cavity-enhanced spontaneous emission rates. The average number of fluorescence photons detected per molecule in 4 {mu}m droplets (where emission rate enhancement has been previously demonstrated) is shown to be approximately a factor of 2 larger than the yield measured for larger droplets where emission rate enhancement does not occur. Within some simple approximations, these results suggest that essentially no emission rate inhibition occurs in this system. A mechanism based on spectral diffusion is postulated for the apparent absence of cavity-inhibited emission and is illustrated by Monte Carlo calculations using time-dependent lineshape functions.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10181685
- Report Number(s):
- CONF-9306210-2; ON: DE94018662; TRN: AHC29421%%81
- Resource Relation:
- Conference: 1993 Edgewood Research, Development and Engineering Center science conference on obscuration and aerosol research,Aberdeen, MD (United States),21-25 Jun 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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