Radiation action on polymethine dyes prepared on insulating substrates as molecular layers

Alexey M. Bonch-Bruevich; E. N. Kaliteevskaya; V. P. Krutyakova; T. K. Razumova

doi:10.1117/12.431206

26 June 2001 Radiation action on polymethine dyes prepared on insulating substrates as molecular layers

Alexey M. Bonch-Bruevich, E. N. Kaliteevskaya, V. P. Krutyakova, T. K. Razumova

Proceedings Volume 4423, Nonresonant Laser-Matter Interaction (NLMI-10); (2001) https://doi.org/10.1117/12.431206
Event: Nonresonant Laser-Matter Interaction (NLMI-10), 2000, St. Petersburg, Russian Federation

Abstract

Action of the resonance radiation of varied power on polymethine dyes coated as submono- and thicker layers onto glass and quartz was studied. Effect of the dye structure on the optical properties of molecular layers was explored. The layer absorption spectra within 320-1000 nm were measured for dicarbocyanine dyes differing in chemical structures and electronic symmetries. The absorption spectra of dye layers contain a few maxima, whose relative intensity is a function of the dye concentration on a surface, and are considerably broader than the solution spectra, irrespective of molecular symmetry. Irreversible transformation of the dye absorption spectra was studied under the action of resonance laser radiation of varied power and on heating in the dark. The heating and the pulsed laser irradiation of low power and energy lead mainly to the optical density redistribution among different spectral maxima. At high-power irradiation, the optical density redistribution is accompanied by the considerable decrease in the optical density. Simultaneously, the extinction coefficient of the layer increased in the short-wave edge of the absorption spectrum, i.e., outside the dye absorption band, indicative of dye destruction via irreversible photo oxidation. It is concluded that the dye layer contains a few types of absorption centers: two types of monomers, dimers, and probably, J-aggragates. The interaction with a substrate affects the symmetry of electronic density distribution in a dye molecule, whereas the irradiation and heating of a layer result in the destruction of dye and affect the relative amount of various absorption centers.

Citation Download Citation

Alexey M. Bonch-Bruevich, E. N. Kaliteevskaya, V. P. Krutyakova, and T. K. Razumova "Radiation action on polymethine dyes prepared on insulating substrates as molecular layers", Proc. SPIE 4423, Nonresonant Laser-Matter Interaction (NLMI-10), (26 June 2001); https://doi.org/10.1117/12.431206

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KEYWORDS

Absorption

Absorbance

Glasses

Molecules

Molecular interactions

Bioalcohols

Pulsed laser operation

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