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Title: Large third-order nonlinearity of new ?-conjugated donor-acceptor polymers with substituted thiophene and 1,3,4-oxadiazole moieties
Authors: Sunitha, M.S.
Adhikari, A.V.
Vishnumurthy, K.A.
Safakath, K.
Philip, R.
Issue Date: 2012
Citation: International Journal of Polymeric Materials and Polymeric Biomaterials, 2012, Vol.61, 7, pp.483-504
Abstract: We present the synthesis of two newly designed, thiophene-based conjugated polymers (P1 and P2) carrying 1,3,4-oxadiazole, 3,4-dinaphthyloxy thiophene, and 3,4-dialkoxy thiophene moieties as potential NLO active materials. Their NLO properties have been investigated both by the Z-scan and degenerate four-wave mixing (DFWM) techniques using 532nm, 7 nanosecond laser pulses. The measured ? and ?(3) values for the polymers are found to be in the range of 1011m/W and 1011esu, respectively. The results indicate that they exhibit good optical-limiting behavior and are promising materials for nonlinear optical applications due to effective two-photon absorption (TPA). 2012 Copyright Taylor and Francis Group, LLC.
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