Particle material recognition using digital in line holography and virtual/real image concepts
Résumé
The authors have shown recently that digital in-line holography (DIH) can recover some features of the electromagnetic near field of large spherical transparent particles. Among these features, a special attention was paid to the photonic jet whose intensity maxima positioning allows to estimate the particle refractive index. In the present communication, we show that, in the framework of the Fresnel diffraction approximation, the reconstructed photonic jet can be seen as the Airy's spot of a spherical lens. More surprisingly, we also demonstrate that DIH can recover an image of this near field structure that can be real or virtual, referring to geometrical optics terminology. Besides the theoretical interest, this concept provides a simple and numerically effective solution to characterize the composition of solid, liquid and gas particles and opens up huge perspectives for multiphase flow investigations.
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