Abstract

The image of the photonic jet (also called caustic) formed by a large, transparent, and spherical particle, reconstructed by digital in-line holography, is shown to be similar to the Airy pattern observed at the focus of a diffraction-limited lens. The analysis of this image, real or virtual depending on whether the particle relative refractive index is above or below one, allows characterizing the particle composition via its refractive index. Experiments clearly demonstrate the value of this method for the simultaneous 3D characterization and differentiation of the dynamics, size, and composition of gas, liquid, and solid particles in multiphase flows.

© 2018 Optical Society of America

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Supplementary Material (3)

NameDescription
» Visualization 1       Particle’s near-field reconstructed by digital in-line holography considering three kind of particles: a droplet, a bubble and an opaque solid. Real or virtual image of the photonic jet, depending on whether the particle relative refractive index is
» Visualization 1       Particle’s near-field reconstructed by digital in-line holography considering three kind of particles: a droplet, a bubble and an opaque solid. Real or virtual image of the photonic jet, depending on whether the particle relative refractive index is
» Visualization 1       Particle’s near-field reconstructed by digital in-line holography considering three kind of particles: a droplet, a bubble and an opaque solid. Real or virtual image of the photonic jet, depending on whether the particle relative refractive index is

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