Pietro Ferraro

Bio: Pietro Ferraro is an academic researcher from National Research Council. The author has contributed to research in topics: Digital holography & Holography. The author has an hindex of 61, co-authored 653 publications receiving 12666 citations. Previous affiliations of Pietro Ferraro include Aeritalia & Centre national de la recherche scientifique.

Self-assembling of multi-jets by pyro-electrohydrodynamic effect for high throughput liquid nanodrops transfer

Abstract: Destabilization of liquid film by electro-hydro-dynamics (EHD) pressure is achieved through the pyroelectric effect on a polar dielectric crystal. We show that by destabilizing the liquid film, periodical self-assembled multi-jets are obtained. The multi-jets operate simultaneously and could be exploited to dispense liquids with nanolitre drops. Such multiple self-assembled liquid jets have significant potential applicability for high-throughput liquid transfer by this novel pyro-EHD ink-jet approach. Since the method avoids the use of nozzles and electrodes, it is especially suitable for highly viscous liquids. Here we present and discuss the new multi-jet process and the results obtained with a liquid polymer (PDMS).

Coherent light microscopy : imaging and quantitative phase analysis

Abstract: Quantitative Phase Microscopy with Digital Holography Approach with High-Coherence Light Sources.- Quantitative Phase Microscopy with Digital Holography Approach with Low-Coherence Light Sources.- Digital Holographic Microscopy with Femtosecond Laser Sources for Characterization of Fast Dynamic Events and Process.- Quantitative Microscopy with a Photorefractive-Based Principle.- Application of Interference Microscopy in Microfluidics and Optofludics Systems.- Optofluidic-Based Microscope.- Characterization of Optical Microsystems Devices (Microlenses, Liquid Lenses, Integrated Optics Interferometrers, Waveguides, MEMs, MOEMs).- Super-Resolution in Interference Microscopy.- Microscopy with UV Light Sources.- Microscopy with IR Sources.- 3D Imaging for Analysis and Tracking of Particles in Fluidodynamic Physics.- Visualization of Trapping Systems to Study Paths of Particles.- Optical Coherent Method for Evaluation and Recognition of Bio-Agents.- Special Methods with Fabrication and Characterization of Self-Assembled Structures. Phase Shifting Techniques in Microscopy.

Investigating fibroblast cells under "safe" and "injurious" blue-light exposure by holographic microscopy.

Abstract: The exposure to visible light has been shown to exert various biological effects, such as erythema and retinal degeneration. However, the phototoxicity mechanisms in living cells are still not well understood. Here we report a study on the temporal evolution of cell morphology and volume during blue light exposure. Blue laser irradiation is switched during the operation of a digital holography (DH) microscope between what we call here "safe" and "injurious" exposure (SE & IE). The results reveal a behaviour that is typical of necrotic cells, with early swelling and successive leakage of the intracellular liquids when the laser is set in the "injurious" operation. In the phototoxicity investigation reported here the light dose modulation is performed through the very same laser light source adopted for monitoring the cell's behaviour by digital holographic microscope. We believe the approach may open the route to a deep investigation of light-cell interactions, with information about death pathways and threshold conditions between healthy and damaged cells when subjected to light-exposure. 3D Morphology and quantitative phase information from late stage of necrosis cell death.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

Abstract: A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fiber grating sensors

Abstract: We review the recent developments in the area of optical fiber grating sensors, including quasi-distributed strain sensing using Bragg gratings, systems based on chirped gratings, intragrating sensing concepts, long period-based grating sensors, fiber grating laser-based systems, and interferometric sensor systems based on grating reflectors.