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19 November 2012 Optical third-harmonic generation measurements in biopolymer complexes
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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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Ana Maria Manea, Alexandrina Tane, Roxana Zgarian, James G. Grote, Francois Kajzar, and Ileana Rau "Optical third-harmonic generation measurements in biopolymer complexes", Proc. SPIE 8545, Optical Materials and Biomaterials in Security and Defence Systems Technology IX, 85450Q (19 November 2012);

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