Abstract
The numerical modeling of two-dimensional spatial field distribution of multiphoton excited fluorescence in the vicinity of a micron spherical ethanol droplet upon illumination by a laser beam was carried out based on the FDTD-technique for the solving of Maxwell equations. Fluorescence sources are considered to be located in “hot” spots inside a spherical particle and can have various power and volume. It is established that the field of fluorescence radiated from backward and forward hemispheres of a particle (in relation to the direction of the excited radiation) is characterized by various angular orientation. With the increase of the multiphoton order of the excitation of fluorescence from the ethanol droplet and corresponding increase in imbalance between the source’s power, “forward” directivity of the radiation reduces and effective angular divergence of the fluorescence in the “backward” direction changes insignificantly.
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