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Information × Registration Number 0224U032605, (0123U103493) , R & D reports Title Innovative photonic technologies of bio-medical direction for the post-war reconstruction of Ukraine popup.stage_title Дослідження швидких спектроскопічних параметрів збуджених електронних станів барвників. Фемтосекундна динаміка оптичної не лінійності. Різноперіодні ЛІППС. Head Bondar Mykhailo V., Доктор фізико-математичних наук Registration Date 26-11-2024 Organization Institute of Physics of National Academy of Sciences of Ukraine popup.description1 The goal of the project is the comprehensive characterization of new fluorescent molecular labels and probes, in particular the determination of their non-stationary and nonlinear optical properties, as well as the development of new techniques for time-resolved diagnostics and the creation of original laser-induced structures. popup.description2 Research object - molecules of organic dyes, nanostructured metal and semiconductor surfaces. Purpose of work - comprehensive characterization of new organic dyes, in particular the determination of their non-stationary and nonlinear optical properties, as well as the development of new techniques for time-resolved diagnostics and the creation of original laser-induced structures. Results and their novelty - 1. The steady-state linear absorption, fluorescence, and excitation anisotropy spectra of the model squaraine dye 2,4-Bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl]-squaraine and newly synthesied squaraines 2,4-Bis[4-[4-(3,5-didecoxyphenoxy)butyl-methyl-amino]-2,6-dihydroxy-phenyl]squaraine і 2,4-Bis[4-[6-(3,5-didecoxyphenoxy)hexyl-methyl-amino]-2,6-dihydroxy-phenyl]-squaraine were obtained, and their solvatochromic and concentration behavior was analyzed. The mutual orientation of the dipole moments of the transitions between the main electronic levels was determined. 2. A new method for measuring two-photon absorption spectra and a schematic diagram of an experiment to study the phenomenon of non-degenerate two-photon stimulated quenching of fluorescence dyes have been developed. 3. The nature of fast vibronic relaxations of squaraine molecules in liquid solutions at room temperature and their characteristic times have been determined. 4. Two-photon absorption spectra of squaraines have been obtained in a wide spectral range and the cross sections of optical stimulated transitions have been determined. 5. Characteristic emission spectra have been obtained during the formation of LIPPS in different polarizations, as well as LIPPS of different periods. The novelty of the results is that a technique for determining two-photon absorption cross-sections based on low-frequency loss-modulation technique was proposed for the first time. For the first time, the polarization spectra of the characteristic radiation during the formation of LIPSS were obtained. Product Description popup.authors Blonskyi Ivan V. Bondar Mykhailo V. Hryn Volodymyr O. Ihor M. Dmytruk Kadan Viktor M. Klishevych Heorhii V. Kostetskyi Anton O. Kuziv Yaroslav B. Pyriatynskyi Yurii I. popup.nrat_date 2024-11-26 Close