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Synthesis and nonlinear optical characterization of copolymers containing alternating 3,4‐dialkoxythiophene and (1,3,4‐oxadiazolyl)benzene units
Author(s) -
Udayakumar D.,
Kiran A. John,
Adhikari A. V.,
Chandrasekharan K.,
Shashikala H. D.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25505
Subject(s) - copolymer , materials science , benzene , nanosecond , z scan technique , characterization (materials science) , refractive index , nonlinear optics , polymer chemistry , fluorescence , saturation (graph theory) , absorption (acoustics) , laser , photochemistry , analytical chemistry (journal) , optics , optoelectronics , chemistry , polymer , nanotechnology , organic chemistry , composite material , physics , mathematics , combinatorics
We report the synthesis and linear and third‐order nonlinear optical (NLO) characterization of two novel copolymers containing alternating 3,4‐dialkoxythiophene and 1,4‐bis(1,3,4‐oxadiazolyl)benzene units. The copolymers were synthesized with a precursor polyhydrazide route. Both copolymers exhibited fluorescence around 430 nm under the irradiation of UV light. The NLO measurements were made with the single‐beam Z‐scan technique with Nd:YAG nanosecond laser pulses at 532 nm. The nonlinear refractive index of the investigated copolymers was negative, and the magnitude was as high as 10 −10 esu. The samples exhibited strong reverse saturation absorption and very good optical limiting properties at the wavelength used. The concentration dependence of third‐order NLO parameters was studied. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007