Oleg Gradov
Institute for Energy Problems of Chemical Physics, Russia
Title: In Situ Tunable Laser Diode Spectroscopy OF The Processes And Products OF The Microwave-Induced Self-Organizatio In The Soft Mater Active Media
Biography
Biography: Oleg Gradov
Abstract
We present here a novel measurement concept for the processes of self-organization in disperse semiconductor media under microwave irradiation [1] using in situ tunable diode laser spectroscopy (TDLS). Unlike the known laser diagnostics of the microwave plasma [2], our approach considers the study not of the discharge resulting from the magnetron flux / beam impact, but of the structures emerged in the disperse medium under the discharge and its torch products or directly under the magnetron effect. Self-assembly under the influence of the microwave field leads to the emergence of special properties of the structures formed in the microwave range, so one can speculate not only about self-assembled reaction-diffusion optoelectronics / photonics based on disperse semiconductors [3], but also about self-assembled reaction-diffusion microwave electronics and in the case of the magnetron-based experiments – even about self-assembled magnetooptics, microwave field-controlled magnetofluidics and self-assembled microwave spintronics. To date we do not possess a sufficient experience in autowave and self-oscillatory measurements (depending on either a gradient / increment of SWR / TWR (standing and travelling wave ratio, respectively) or the waves in the medium and their SWR / TWR, detected by the medium as a result of its self-organization under microwave radiation, is studied) [4]. If it is possible to perform a local laser irradiation in the variable spectral range, since it is also possible to characterize in situ the spectrum of the self-assembled structures and to suggest a possible mechanism of their self-assembly in the active medium from the known microwave sensitivity of the disperse semiconductor precursors. Tunable laser diodes and fiber spectrometers allow to perform such complex measurements successfully, and hence, stimulate the development of the novel research area in the framework of nonlinear physical chemistry, such as microwave-induced self-assembly of dissipative structures.