A study of thermally stimulated reversible rearrangement of the structure and optical parameters of molecular layers and solutions: IR image visualization based on the stereoisomerization of molecular systems

L. N. Asnis; E. N. Kaliteevskaya; V. P Krutyakova; T. K. Razumova; A. N. Tarnovskii; A. S. Tibilov; S. A. Chizhov

doi:10.1117/12.786944

15 January 2008 A study of thermally stimulated reversible rearrangement of the structure and optical parameters of molecular layers and solutions: IR image visualization based on the stereoisomerization of molecular systems

L. N. Asnis, E. N. Kaliteevskaya, V. P Krutyakova, T. K. Razumova, A. N. Tarnovskii, A. S. Tibilov, S. A. Chizhov

Author Affiliations +

Proceedings Volume 6985, Fundamentals of Laser Assisted Micro- and Nanotechnologies; 698508 (2008) https://doi.org/10.1117/12.786944
Event: Fundamentals of Laser Assisted Micro- and Nanotechnologies, 2007, St. Petersburg, Russian Federation

Abstract

Effect of temperature on the optical parameters of the molecules in the homologous series of 10 dicarbocyanine polymethine dyes was studied. The thermally and photostimulated reversible changes in the isomer compositions and optical properties of solutions and molecular layers were investigated experimentally. The effect of temperature on the optical density, absorption spectra, fluorescence intensity, fluorescence quantum yield, photoisomerization quantum yield, and kinetics of changes in the isomer composition of the solutions was studied in the range (-60÷+60)°C. It was shown that the thermal sensitivity of the optical parameters of the polymethine molecules depends on the electrondonating ability of end groups. The reversible relative changes in the optical density of the solution with temperature are (0.4-1.4) % /deg. The range of relative changes of the fluorescence intensity is (1-2.3) % /deg. The new method of direct transformation of a thermal image into visible image with the aid of three-level molecular systems was proposed involving optical excitation from the low state into the intermediate fluorescent state and the thermally stimulated transitions from this state into the nearby upper state. The visible image can be observed by the optical methods, either by measuring the fluorescence intensity or as a change in the optical density of a screen of the detector in the region where the thermal image is formed.. The bolometric matrix-receiving medium was polymethine dye, which undergoes isomerization, i.e., changes structure under the action of thermal and optical radiation.

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L. N. Asnis, E. N. Kaliteevskaya, V. P Krutyakova, T. K. Razumova, A. N. Tarnovskii, A. S. Tibilov, and S. A. Chizhov "A study of thermally stimulated reversible rearrangement of the structure and optical parameters of molecular layers and solutions: IR image visualization based on the stereoisomerization of molecular systems", Proc. SPIE 6985, Fundamentals of Laser Assisted Micro- and Nanotechnologies, 698508 (15 January 2008); https://doi.org/10.1117/12.786944

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