Nonlinear optical studies on new conjugated poly{2,2 l-(3,4- dialkoxythiophene-2,5-diyl) bis[5-(2-thienyl)-1,3,4-oxadiazole]}s
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Date
2010
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Abstract
Three new donor-acceptor type poly{2,2 1-(3,4-dialkoxythiophene- 2,5-diyl)bis[5-(2-thienyl)-1,3,4-oxadiazole]}s (P1, P2, and P3) were synthesized starting from thiodiglycolic acid and diethyl oxalate through multistep reactions. The polymerization was carried out using chemical polymerization technique. The optical and charge-transporting properties of the polymers were investigated by UV-visible, fluorescence emission spectroscopic and cyclic voltammetric studies. The polymers showed bluish-green fluorescence in solutions. The electrochemical band gaps were determined to be 2.03, 2.09, and 2.17 eV for P1, P2, and P3, respectively. The nonlinear optical properties of new polymers were investigated at 532 nm using single beam Z-scan and degenerate four-wave mixing (DFWM) techniques with nanosecond laser pulses. The polymers exhibited strong optical limiting behavior due to "effective" three-photon absorption. Values of the effective three-photon absorption (3PA) coefficients, thirdorder nonlinear susceptibilities (? (3)), and figures (F) of merit were calculated. © 2010 Wiley Periodicals, Inc.
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Keywords
3,4-dialkoxythiophene, Band gaps, Chemical polymerization, Degenerate four-wave mixing, Diethyl oxalates, Donor-acceptors, Fluorescence emission, Green fluorescence, Multistep reactions, Nanosecond laser pulse, Non-linear optical properties, Nonlinear optical studies, Optical limiting behavior, Oxadiazoles, Single beam, Thienyl, Thiodiglycolic acid, Third-order nonlinear susceptibility, Three photon absorption, Three-photon absorption (3PA), UV-visible, Voltammetric studies, Absorption, Fluorescence, Four wave mixing, Light absorption, Multiphoton processes, Optical properties, Photons, Polymerization, Pulsed laser applications, Biodegradable polymers, chemical composition, fluorescence, laser, polymerization, synthesis, transport process
Citation
Journal of Applied Polymer Science, 2010, 117, 5, pp. 2641-2650