Optical nonlinearities induced by laser radiation in some fatty acids from the biological membrane

Mihaela A. Ghelmez; Maria Honciuc; Livia Sterian; Cristian Gheorghe

doi:10.1117/12.335795

4 January 1999 Optical nonlinearities induced by laser radiation in some fatty acids from the biological membrane

Mihaela A. Ghelmez, Maria Honciuc, Livia Sterian, Cristian Gheorghe

Proceedings Volume 3565, Thermal Therapy, Laser Welding, and Tissue Interaction; (1999) https://doi.org/10.1117/12.335795
Event: BiOS Europe '98, 1998, Stockholm, Sweden

Abstract

In this paper, we present a study of pure arachidonic acid, arachidic acid, other fatty acids (FA) and mixtures with cholesterol (Ch) in different ratio of compounds, having smectic C liquid crystal (LC) properties. Very thin systems (`membranes') of FA and mixtures, manufactured by us, were subjected to some electrical measurements, that show a new distribution, induced by Ch, of the space charge in the system. The FA and mixtures' samples were also sandwiched between two glass plates of transparent SnO₂ electrodes and studied under dc and ac electric fields. The hysteresis curves of the current versus the applied voltage exhibited a nonlinear dielectric feature and a negative resistance. We studied the change of the fundamental IR and second harmonic pulsed beam of a Nd³⁺ glass laser, in the time domain, after passing through our samples; the optical output power of a He-Ne laser beam ((lambda) equals 6328 angstroms, P_max equals 20 mW), from the LC cells situated between parallel and crossed polarizers was registered. A nonlinear optical behavior of the samples and some memory effects were emphasized. Also a correlation between the electric and optical nonlinearity of the samples seems to be possible.

Citation Download Citation

Mihaela A. Ghelmez, Maria Honciuc, Livia Sterian, and Cristian Gheorghe "Optical nonlinearities induced by laser radiation in some fatty acids from the biological membrane", Proc. SPIE 3565, Thermal Therapy, Laser Welding, and Tissue Interaction, (4 January 1999); https://doi.org/10.1117/12.335795

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