Nonlinear all-optical light valves fabricated on mesoscopic Ti-, Si-substrates

• Published in: Journal of molecular liquids 2018-10, Vol.267, p.34-37
• Main Authors: Bugaychuk, S., Iljin, A., Telbiz, G., Zhulai, D.S., Leonenko, E., Romanovska, N., Gridyakina, A., Bordyuh, A., Kravchuk, M., Polishchuk, A.
• Format: Article
• Language: English
• Subjects: Degenerated two-wave mixing technique; Hybrid liquid crystal cell; Mesostructured SiO2 and TiO2 films; Nonlinear optical susceptibility; Third-order nonlinear absorption; Z-scan technique
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.01.170

Nonlinear optical properties are investigated in new composite materials. The investigated samples have been (i) a glass substrate covered by mesostructured (SiO2 or TiO2) film filled with the dye Rhodamine 6G, and (ii) a hybrid liquid crystal (LC) cell made on such mesostructured film. The nonlinear optical coefficients have been defined by two different techniques: the degenerate two-wave mixing in the regime of Raman-Nath self-diffraction, and the Z-scan method. The nonlinear optical absorption in the hybrid LC cell is strengthening under continuous laser radiation. The hybrid LC cell is perspective for applications in optical limiting and light-control-light LC valves. •Fabricating stable mesostructured sol-gel films with intercalated dye molecules•New hybrid liquid crystal cell containing a mesoscopic silica film•Enhanced nonlinear-optical absorption in new hybrid liquid crystal cell