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Nonlinear spectroscopy with high power THz waves

Final Report Summary - HINTS (Nonlinear spectroscopy with high power THz waves)

The HINTS (High Intensity Nonlinear THz Spectroscopy) project was focused on the generation and the use for nonlinear spectroscopy of high intensity THz pulses. As originally planned, the activities of Dr AG Stepanov started with the setting-up up of an optical system for generation of high energy single-cycle THz pulses at GAP-Biophotonics laboratory at the University of Geneva. The system has been tailored to the Geneva laser output (amplified Ti:Sapphire, 6 mJ/pulse output) to optimize the THz beam both in terms of energy and spectrum. The THz generation set-up has been applied since to different on-going experiments: gas-phase THz-induced selective molecular dissociation, optical rectification in nonlinear nanoparticles, study of transport phenomena in semiconductor materials. These different research lines and have already brought some interesting preliminary results (reported in the two periodic reports) that will be now further investigated and exploited.
The variety of applications of the set-up installed in Geneva testifies of the success of the HINTS project, which has allowed the efficient technology transfer from the Russian applicant to the Swiss group. Moreover, an important aspect of HINTS activities has been related to the development of ad hoc numerical simulations for defining new THz generation approaches aimed at further extending the THz spectral range accessible with Ti:Sapphire lasers, as researchers would like to tackle long standing problems like water network organization using higher THz frequencies than those obtained with present methods.
During the project, the dissemination activities have been equally very intense, as they include: two papers published/accepted in peer-reviewed journals, two conference proceedings, and four contributions to conferences (two invited). Thanks also to the scientific visibility acquired during the project, Dr Stepanov has now moved to the Paul Scherrer Institute in Villingen (Switzerland) to continue his research activities on similar subjects. This geographical proximity will allow continuing the collaboration with Geneva in an efficient manner and bringing to termination the various research activities started during HINTS.

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