Synthesis, characterization and two-photon absorption based broadband optical limiting in diarylideneacetone derivative

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• 作者：B. Rajashekar^a ; P. Sowmendran^b ; S. Siva Sankara Sai^b ; G. Nageswara Rao^a ; ^{gnageswararao@sssihl.edu.in}
• 关键词：D-蟺-A-蟺-D ; z-Scan ; Two-photon absorption ; Optical limiting
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2012
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：15 June, 2012
• 卷：238
• 期：Complete
• 页码：20-23
• 文件大小：462 K

摘要

A donor-蟺-acceptor-蟺-donor (D-蟺-A-蟺-D) type Bis-Chalcone, (1E,4E)-1,5-di-2-thienylpenta-1,4-dien-3-one (D2TDO) was synthesized by Claisen-Schmidt reaction. Structural characterization was done with the help of UV, FT-IR, ¹H NMR, ¹³C NMR and Mass Spectroscopic techniques. Through gravity settling method, a homogenous film of D2TDO with 65 渭m thickness was made in poly(methylmethacrylate) matrix. The third-order absorptive nonlinearity and resultant optical limiting behavior of the D2TDO film were studied by employing open aperture z-scan method in both nanosecond and femtosecond excitation regimes. Through numerical simulations, the mechanism of nonlinear absorption was found to be a two-photon absorption process with broadband response. The optical limiting performance of the molecule has its origin from the molecule's peculiar D-蟺-A-蟺-D structure which allows for a greater extent of 蟺 electron delocalization due to a strong 蟺-electron donor like thiophene.