Nonlinear optical properties of chiral polyesters: a joint experimental and theoretical study

Philip Biju; K. Sreekumar

doi:10.1117/12.514840

14 October 2003 Nonlinear optical properties of chiral polyesters: a joint experimental and theoretical study

Philip Biju, K. Sreekumar

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514840
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

A series of polyesters containing donor-acceptor π-conjugated polar segments (4,4'-azobenzene dicarbonyl chloride) and chiral building units [L(+)-diethyl tartrate] in the main chain were synthesized and characterized by spectroscopic (IR, UV-Vis, ¹H NMR, ¹³C NMR), thermal (TG/DTG, DSC), and optical (refractive index, optical rotation techniques). Chiral order was induced with a preferred helical sense to attain noncentrosymmetric ordering of dipoles (polar order) in macroscopic dimensions by chemical synthesis (chemical poling). A comprehensive attempt has been made to correlate the polar order of the polymer chains with the chiral order arising out of a preferred helical sense of the chains. This has been achieved by adopting four different theoretical models and comparing the results with the experimentally observed values of the second order polarizability tensor β. The models used are (1) Logarithmic Law of Mixing (LLM), (2) the Extended Boundary Condition Method (EBCM), (3) The Random Field Ising Model (RFIM) and (4) Semiempirical Computational Model (SCM). The results of the theoretical predictions are compared with the experimentally determined values of β.

Citation Download Citation

Philip Biju and K. Sreekumar "Nonlinear optical properties of chiral polyesters: a joint experimental and theoretical study", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514840

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