Shock waves emerge in various fields and trigger effects like rogue waves, supercontinuum generation and emission of resonant radiation. Despite shock waves ubiquity, their effect on the coherence properties is barely understood. Among the open problems, the quantum features of shock waves are particularly intriguing for the possibility of generating non-classical states by highly nonlinear regimes. In a manuscript in arXiv, Maria Chiara Braidotti, Antonio Mecozzi, and Claudio Conti theoretically predict classical squeezing of light during shock formation. The picture above shows the Wigner transform of the field in the squeezed regime. By using techniques of rigged Hilbert space quantum mechanics, they show that a coherent state develops squeezing which stops in proximity of the shock point. The analysis holds true for temporal and spatial shock waves in highly nonlocal regime.These results open a new scenario in shock phenomena and link nonlinear propagation in extreme regimes with quantum optics and related applications.
Author: claudio
Press release on the VANGUARD project
At minute 7,15
The results of the team of the Vanguard project presented at at the 60th annual meeting of the Biophysical Society, in Los Angeles appeared in Physics World
http://nanotechweb.org/cws/article/tech/64211
http://www.azonano.com/news.aspx?newsID=34445
https://cosmosmagazine.com/technology/five-new-uses-miracle-material-graphene
http://www.directorstalk.com/graphene-oxide-could-help-fight-hospital-acquired-infections-2/
http://www.milanofinanza.it/articoli/i-nuovi-killer-di-batteri-2075304?preview=false&access=FA
The research has been spotted by the Dailymail !
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http://www.liberoquotidiano.it/news/salute/11893222/Funghi-e-batteri-killer-in-ospedale.html
Press Release in Italian “Donna del Corriere della Sera”
Press release in the Netherlands
Press release in Japan !
Giant optothermal nonlinearity of Silica Areogel
Solitonization of Anderson localisation and optical-event horizons
In a paper in arXiv, Mohammed F. Saleh, Claudio Conti and Fabio Biancalana show that the solitonization of the Anderson localization and the formation of optical horizons by cluster of solitons explain the rogue-solitons in supercontinuum generation.
This is complex photonics !
Turbulent Transitions in Optical Wave Propagation
In a paper published in Phys. Rev. Lett. , D. Pierangeli, F. Di Mei, G. Di Domenico, A. J. Agranat, C. Conti, and E. Del Re, report the direct observation of the onset of turbulence in propagating one-dimensional optical waves. The transition occurs as the disordered hosting material passes from being linear to one with extreme nonlinearity. As the response grows, increased wave interaction causes a modulational unstable quasihomogeneous flow to be superseded by a chaotic and spatially incoherent one. Statistical analysis of high-resolution wave behavior in the turbulent regime unveils the emergence of concomitant rogue waves. The transition, observed in a photorefractive ferroelectric crystal, introduces a new and rich experimental setting for the study of optical wave turbulence and information transport in conditions dominated by large fluctuations and extreme nonlinearity.