Deformations of biological tissues with photothermal nanoparticles under laser irradiation

Abstract

In this work, optical coherence tomography (OCT) of gel phantoms and cartilage tissue of the joint impregnated with nanoparticles was performed under laser exposure to an erbium fiber laser with a wavelength of 1.56 m. Multifunctional "magnetite + gold" nanoparticles with a "core-shell" structure were obtained by pulsed laser ablation of metals in a liquid, and oxide bronzes KxTiO2 and NaxTiO2 are formed in the processes of self-propagating high-temperature synthesis and mechanical activation. An improvement in the efficiency of the diagnostic method by introducing antireflection additives and absorbing nanoparticles due to a decrease in the irradiation intensity and an increase in the photothermal effect is shown. OCT elastography data indicate the dependence of tissue deformation on the preliminary history of tissue exposure.