By exploiting a novel quantitative imaging technique based on Synthetic Optical Holography, we describe the dynamic behaviour of optical vortices in a speckle pattern generated by the interference of random scattered waves from the rough surface of a glass substrate. The system combines the advantages of digital holography and low-coherence interferometry to retrieve multiple holograms with sub-nanometric spectral resolution. The collection of multiple images of the complex scattered field allows to provide a statistical characterization of the phase singularities by changing the exciting wavelength.
Dynamics of Optical Vortices in Speckle Patterns with Sub-Nanometric Spectral Resolution / Di Donato, A.; Mencarelli, D.; Criante, L.; Pierantoni, L.; Morini, A.; Farina, M.. - ELETTRONICO. - (2020), pp. 1-3. (Intervento presentato al convegno 2020 Italian Conference on Optics and Photonics, ICOP 2020 tenutosi a ita nel 2020) [10.1109/ICOP49690.2020.9300337].