Abstract
Two colliding liquid droplets exhibit a unique morphology with a high-Q optical cavity. The colliding droplets substantially intensify Raman-scattered light or fluorescence through optical resonance. In this study, we report the fluorescence of acceptor molecules via energy transferred from photoexcited donor molecules in two colliding droplets, each containing either acceptor or donor molecules. The results indicate that the transferred energy intensifies the fluorescence through optical resonance in the colliding droplets, which extends the wavelength tunability range of the resonance-enhanced fluorescence emitted from the droplets and facilitates the application to lasing media.
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