Embedded Files
Current Research
Current Research
Random Lasers
Random Lasers
Aggregates of dielectric particles are able to entrap light and if a gain medium is added they become Random Lasers, lasers with disordered cavities. We fabricate and do experiments on RLs to confirm fundamental physics paradigms and to propose novel photonic devices.
Random laser fluctuations and replica symmetry breaking (cited in the motivations of the Physics Nobel Prize 2021 to Giorgio Parisi).
Wispering Gallery Lasers
Wispering Gallery Lasers
Whispering Gallery resonators are micron sized optical cavities with a hollow geometry that, thanks to the phenomenon of total internal reection, entrap light at their surface. The constructive interference of circulating light leads to the formation of sharp optical resonances with strong dependence on the shape, size and refractive index of the cavity. We use these resonators to make microscopic laser sources with small mode volume, low lasing threshold and very high quality factors.
We realize photonic barcodes made of arrays of droplet microlasers doped with dielectric particles each one with distinct emission spectral line.
Whispering gallery droplet laser in solid matrix
Nonlinear Optics in GO
Nonlinear Optics in GO
There is significant interest in manipulating the intensity and shape of laser pulses in a number of advanced optical technologies using NLO materials and to this aim both nonlinear absorption and refraction of graphene oxide (GO) have been extensively investigated.
We review the most important findings and we investigated the reverse saturable absorption of GO flakes.
Graphene oxide flakes are thermophilic and migrate towards laser beam increasing the absorption. Reverse saturable absorption
Former Research
Former Research
Shock Waves
Shock Waves
We directly visualized and quantitavely analyzed the formation and propagation of dispersive shock waves in liquids caused by nonlocal thermal effect.
Fluorescence images showing the formation of dispersive shock waves by increasing the injected laser power and the nonlinearity.
Soft Matter
Soft Matter
We investigated: the nonlinear optical response of a clay during its aging by using dynamic Z-scan technique; the aggregation of binary suspensions of colloids by dynamic light scattering and the solidification of a polymeric polycristal with impurities by confocal microscopy.
The fluorescent impurities are expelled from the crystalline domains during the solidification and thicken at the grain boundaries.
Page updated
Google Sites
Report abuse