The biopolymer deoxyribonucleic acid (DNA) was first functionalized with the surfactant cetyltrimethylammonium
(CTMA) surfactant and then with the Rhodamine 610 dye at its different concentrations. The obtained complexes are
well soluble in a number of organic solvents. Regular thin films were obtained by spin coating on glass substrates and
their spectroscopic as well as nonlinear optical properties were studied as function of dye concentration. The THG
susceptibility increases, within the experimental accuracy, with rhodamine concentration. The measured its relatively
large value is due to the two photon contribution. The concentration dependence of χ (3) (−3ω;ω,ω,ω) can be well
fitted, within experimental accuracy, by a linear function.
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