Microsources and Microtransformers of Optical Radiation for Communication Systems, Pharmaceutics and Ecology: Elaboration of the Bases of Production Technology and Optimization of Functions
Tech Area / Field
- PHY-OPL/Optics and Lasers/Physics
- CHE-THE/Physical and Theoretical Chemistry/Chemistry
3 Approved without Funding
B.I. Stepanov Institute of Physics, Belarus, Minsk
- Siberian Branch of RAS / Institute of Automation and Electrometry, Russia, Novosibirsk reg., Novosibirsk\nBelarussian State University / Institute of Applied Physical Problems, Belarus, Minsk\nSiberian Branch of RAS / Institute of Atmospheric Optics, Russia, Novosibirsk reg., Novosibirsk
- University of Potsdam / Institute for Chemistry, Germany, Potsdam\nRuhr Universität Bochum / Laseranwendungstechnik und Messsysteme, Germany, Bochum\nUniversite de Rouen / CORIA-UMR 6614 Laboratory, France, Mont Saint Aignan\nUniversitat Regensburg / Institute for Physical and Theoretical Chemistry, Germany, Regensburg\nFreie Universität Berlin / Institut für Chemie, Germany, Berlin
Project summaryProject’s purpose:
Elaboration of the regimes of effective operation of optical microtransformers and microlasers and the technological bases of production of new materials on the base of nano- and microparticles.
Actuality of investigations:
Improvement of communication systems in order to develop ultrafast optical data processing systems and to reduce in size and orientation toward energy and resource saving technology in connection with the problems of ecology stimulated interest to dielectric microparticles, microfibers and nanostructures as comfortable objects of realization of miniature devices.
Microresonator on the base of a dielectric microparticle has a series of advantages: low threshold for different nonlinear effects, strong focusing of radiation, small sensitivity to destruction and superheating, comfortable coupling with optical fibers.
In the last time investigations in this area are extended. Different optical effects on the base of microparticles, in particular, lasing on the whispering-gallery modes (WGM) or morphology-dependent resonances (MDR’s) in solid microparticles and droplets, stimulated Raman scattering (SRS), generation of the second and third harmonics, were experimentally realized, anomalous physical effects were revealed («Optical Processes In Microcavities»/editors Chang R.K., Campillo A.J. World Scientific Publishing Co. 1996. P. 434. Lange S. and Schweiger G. JOSA B. 1996. V.13. No 9. P.1864. Taniguchi H. Jpn. J. Appl. Phys. 1993. V. 32. No 11 A. P. L 1615).
Insertion of nanostructures from the particles of noble metals into the microresonator leads to the further increase of effectiveness of excitation of various optical processes. Multiplicative gain of optical responses, caused by joint action of the intense local field inside nanostructure and high intracavity field, takes place. Low-threshold generation and effective excitation of multi-photon processes were observed in such nanostructures (W. Kim, V.P. Safonov, V.M. Shalaev, R.L. Armstrong. Phys. Rev. Lett. 1999, 82, 4811; V.P. Drachev, W. Kim, V.P. Safonov, V.A. Podolskiy, N.S. Zakovryashin, V.M. Shalaev, and R.L. Armstrong. J. Modern Optics 2002, 49, 645).
Strong concentration of energy inside microparticles opens up also new possibilities in the field of making of new materials including medicines and pharmaceutics, for laser control of chemical reactions. Investigations in the field of laser control of chemical reactions by the selective excitation of molecules in the macrovolumes intensively evolve, but the investigations are largely theoretical. Calculations point to the possibility of effective population of given state of a molecule for the definite parameters of laser impulse. The possibility of the control of dissociation, isomerization and other simplest chemical physics processes are also shown (J. Manz and L.Woeste, eds., Femtosecond Chemistry: Verlag Chemie, Weinheim, 1995). Experimental investigations in this direction are rather complex, nevertheless they are successfully performed in a series of scientific centers (A.H. Zewail, ed., Femtochemistry-Ultrafast Dynamics of the Chemical Bond. World Scientific, Singapore, 1994. Sbanski O., Roman V.E., Kiefer W., Popp J. JOSA A. 2000. V.17. No 2. P.313-319).
Influence of the proposed Project on the progress in given field:
- production of the new class of devices in the field of microtechnics possessing reduced threshold of realization of laser oscillation, nonlinear effects and high sensibility of detection of microimpuruties;
- production of resource and energy saving technologies for making new materials by way of control of chemical reactions.
Competence of the Project team:
Highly skilled specialists in the field of optical spectroscopy, laser physics, theoretical physics, nonlinear optics, physics and spectroscopy of plasma, optics of disperse media, techniques for control, components separation of Institute of Physics of National Academy of Sciences of Belarus, Scientific Research Institute of Applied Physical Problems at the Belorussian State University, Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences and Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences, widespread known by their scientific results in the fields of elaboration of laser systems for different purposes, production of optical devices, propagation of high intense laser radiation in aerosols and precise methods of diagnostics are attracted to realize the goal of the proposed Project. There are 5 Professors and 8 Doctors in the group of scientists.
Authors of the Project contributed significantly to the theoretical and experimental investigations in the field of proposed Project. Last years theoretical investigations of generation of optical radiation of aerosol microlaser, nonlinear dynamics of lasers, theoretical and experimental investigations of stimulated Raman scattering in aerosol particles, optico-acoustical effect inside the particles under the action of picosecond laser radiation have been performed; method of ultrafast selective excitation of vibrational levels of a molecule by laser impulse and laser control by chemical reactions has been developed; experimental device has been produced and the procedure of the control of sizes and the concentration of condensed particles in erosion laser flame has been carried out; the device was produced and the experimental investigations of laser oscillation and multi-photon processes in composites of microresonator-silver nanostructures-dye molecules for continuous radiation and nano-, picosecond pulses of pumping have been carried out.
46 scientific papers were published as a result of these investigations.
Following results will be obtained:
1. elaboration of the theory and determination of conditions of optimal laser generation in dielectric microparticles for some regimes;
2. experimental detection of features of nonlinear transformation of femto-second laser radiation in liquid aerosol of dibutilphtalat with rhodamine 6G;
3. elaboration of the theory and determination of the advantages and peculiarities of the dynamics of selective excitation of molecules in aerosol resonators in the field of ultrashort laser pulses;
4. elaboration on the base of original method of experimental set and will be demonstrated making of solid aerosol microparticles with automatic control of their parameters with minimal time resolution of 25 ns;
5. elaboration of the new procedure of making and detection peculiarities of Raman scattering, spontaneous emission and generation of optical radiation in composites: metal nanostructure-microresonator.
Scientific significance of the obtained results is widening the fundamental knowledge in the fields of
- nonlinear interaction of laser radiation with matter in microvolumes in the condition of change of spectroscopic characteristics of atoms;
- nonlinear transformation of optical radiation by nano-microcomposites.
Applied significance of the results of Project is in the suggestion of
- absolutely new type of microsystems with faster clock speed and increased memory for information technologies (sources, transformers, bistable elements, and so on);
- new procedure of making of composites (metal nanostrucrure)-microresonator which guarantees the great factors of increase of optical responses. It is very perspective for making lasers, microanalyzers, devices of optical recording of information and control of light by light;
- resource and energy saving technologies of making new materials with the given properties; including for pharmaceutics;
- model experimental set for obtaining aerosols with simultaneous monitor of their characteristics in the real scale-time.
Meeting ISTC goals and objectives
- providing opportunities for large group of scientists and engineers of Belarus and Russian Federation, particularly those who connected with weapons, use their knowledge and skills in elaboration of the basis of technologies and devices for systems of communication, ecology and pharmaceutics;
- promoting integration of the Project participants of Belarus and Russia into the international scientific community during joint investigations of the transformer of optical radiation by microparticles and nano- microcomposites;
- supporting basic and applied research and technology development contributing to resolve of national and international problems connected with resource and energy saving;
- reinforcing the transition of the Project partners of Belarus and Russia to market-based economies.
Volume of work in the frame of the Project relies on 3 years with whole length of time of work of 380.5 person/month and directs to solve five interrelation problems. Institute of Physics of National Academy of Sciences of Belarus will carry out the theoretical elaborations, Scientific Research Institute of Applied Physical Problems at the Belorussian State University will carry out the experimental elaborations, Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences will carry out the theoretical and experimental elaborations and Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences will carry out the experimental elaborations.
Task 1. Elaboration of theory of laser oscillation in dielectric microparticle.
Task 2. Experimental and theoretical investigations of processes of induced light scattering in dielectric spherical microresonators under the action of supershort pulse laser radiation.
Task 3. Theoretical investigation of selective excitation of atoms and molecules in dielectric aerosols controlled by optimal laser fields.
Task 4. Development experimental set for production of the aerosol particles with given parameters and study of reaction of aerosol particle ensemble on external irradiation of electromagnetic radiation.
Task 5. Experimental investigation of lasing and multi-photons processes at multiplicative gain of optical responses in the composites of dielectric microcavity/ metal nanostructure /adsorbed molecules.
Foreign Collaborators: Grehan G. (Complex de Recherche Interprofessionnel en Aerothermochimie, France), Manz J. (Universitaet of Berlin, Germany), Schweiger G. (Ruhr-Universitaet Bochum, Germany), Saalfrank P. (University of Regensburg, Germany) will have early admission to results obtained in the course of Project implementation, will discuss the obtained results, will be take part in preparation for joint publications, assistance for Project participants to join international meetings. After the finish of the project joint study of the perspectives of use of obtained results will be done.
Technical approach and methodology.
Technical approach and methodology, being the basis of the Project, is based on the lasting experience of the Project authors in range of laser physics, spectroscopy, optics of disperse media, physics of plasma. Quantum-mechanical, optical, laser-physical, plasma-spectroscopic and others methods of research will be used when working out on the Project.
Task 1. Elaboration of theoretical model of nonstationary generation of optical radiation in a dielectric microparticle is based on the expansion of electromagnetic field in terms of morphology-dependent resonances with the coefficients depending on time. First model of two-mode generation includes overlapping of spatial resonance structures.
Task 2. Original method of notion of expansion coefficients are used when the optimal laser pumping geometrical schemes of whispering gallery modes in spherical microparticles by radiation with the complex spatial profile of beam of rays (the Gauss-Hermite beams) is determined. In studies of peculiarities of transformation of laser impulse by dyes incapsulated inside spherical microresonators, their most adequate resonance properties are taken into account. Femtosecond laser with the wavelength 0.82 mm, impulse energy of 3-5 nJ and Nd-YAG laser with the wavelengths 1.06 mm and 0.53 mm, impulse duration of 10 ns are used as the incident radiation.
Task 3. When elaborating the theoretical model of multi-photon excitation of molecules inside microresonator irradiated with ultra-fast laser impulse, system of equations, describing dynamics of multilevel quantum system excitation in nonstationary field, are first supplemented by the model of field inside microparticle in the form of morphology-dependent resonances. The goal of this task is to work out the self-consistent description of field dynamic and internal excitation of a molecule in a spherical microparticle and to determine peculiarities of selective excitation of molecules.
Task 4. Original procedure of separation of probing radiation will be worked out for making production system of dielectric microparticles. Computer-aided control system permits to monitor the parameters of microparticles with time resolution up to 25 ns, with sizes up to 2 mm at distances of the target surface up to 200 mm.
Task 5. Originality of experimental investigation of laser oscillation and multi-photon processes at multiple increase of optical responses in composite dielectric microresonator/ metallic nanostructure/ adsorbed molecules is in the making and use of various nano-microcomposites. It is assumed to use colloidal aggregates of noble metals and nanocomposites, obtained by laser evaporation of metallic target, as nanostructures. A cylindrical tubes and rods, aerogel of porous quartz and photon crystals as microresonators will be used. Photon crystals will be prepared by selective laser photomodification of silver colloidal aggregates / dye molecules composite. Nano- and picosecond Nd:YAG-laser (with frequency convertors) and femtosecond Ti-sapphire lasers will be used.
The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.
ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.