HiNTS · Nonlinear spectroscopy with high power THz waves
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2011-07-05 → 2013-07-04
- Финансиране от ЕС
- 246 905 €
- Участници
- 1
- Схема
- MC-IIF
Линиите свързват координатора с партньорите.
Накратко на български
Високоинтензивните терахерцови импулси се използват за анализ на молекули, полупроводници и наночастици. Те помагат за по-доброто разбиране на процеси като организацията на водните мрежи чрез разширяване на достъпния спектрален диапазон.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
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.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The characteristic energy of many fundamental processes in molecules and condensed matter lies in the terahertz (THz) frequency range; examples include biologically important collective vibrations of proteins, crystal lattice resonance oscillations, electron transitions in semiconductor nanostructures, and Cooper pairs formation in superconductors. Nonlinear THz spectroscopy can provide new information about these processes. However, very few studies on nonlinear THz spectroscopy have been published to date, in contrast to the large number of studies on nonlinear spectroscopy in the visible range. One of the main reasons limiting the development of nonlinear THz spectroscopy is the lack of available sources of high-power THz radiation. Many previous studies on THz nonlinear spectroscopy have been performed using accelerator-based sources. However, these sources present the typical drawbacks associated with large-scale facilities. A few laser-driven table-top THz generation techniques have been proposed and realized. Usually the power of the THz waves delivered this way is relatively weak. Since 2003, I have actively worked on the development of the tilted-pulse-front pumping THz generation scheme originally proposed by J. Hebling in 2002. This method allows to efficiently scaling up the energy of single-cycle THz pulse. Very recently, in two joint experiments with the host group, I have demonstrated the generation of the highest energy single-cycle THz pulses to date produced with a laser-based approach. As a continuation of this preliminary demonstration, during this project I plan to exploit the unique high-power laser facility of the host group and develop a permanent laser-driven platform for obtaining high power ultrashort THz pulses with variable parameters for performing nonlinear spectroscopy in the THz frequency range. In particular, I intend to study THz nonlinear properties of new metamaterials and nonlinear interaction of THz waves and laser filaments.
Оригинален текст от CORDIS (на английски).
Участници
- UNIVERSITE DE GENEVE · GeneveКоординаторШвейцария
Връзки
Данни: CORDIS, © Европейски съюз