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Proceedings Paper

Second-order nonlinear optical properties of zwitterionic chromophores
Author(s): Ayele Teshome; Inge Asselberghs; David J. Clarke; Ayla P. Middleton; M. Delower H. Bhuiyan; Gerald J. Smith; Andrew J. Kay; Koen Clays
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Paper Abstract

The molecular linear and second-order nonlinear optical (NLO) properties of a series of donor (D)-π-acceptor (A) merocyanine molecules have been studied in three solvents, dimethylformamide (DMF), tetrahydrofuran (THF), and chloroform (CHCl3). All the compounds have a cyanodicyanomethylidenedihydrofuran electron acceptor system with either a pyridinylidene or quinolinylidene donor group. In high polarity solvents the molecules with a quinolinylidene donor have larger first hyperpolarizabilities than those with a pyridinylidene donor, while the opposite is true in low polarity solvents. The molecules under investigation have an aromatizable donor unit, which leads to a high degree of charge separation in the ground-state; as a result they have a strong tendency to aggregate. To minimize these interactions arene-rich bulky groups have been introduced in a number of these compounds.

Paper Details

Date Published: 18 May 2010
PDF: 9 pages
Proc. SPIE 7722, Organic Photonics IV, 772228 (18 May 2010); doi: 10.1117/12.854664
Show Author Affiliations
Ayele Teshome, Katholieke Univ. Leuven (Belgium)
Inge Asselberghs, Katholieke Univ. Leuven (Belgium)
David J. Clarke, Industrial Research Ltd. (New Zealand)
Ayla P. Middleton, Victoria Univ. of Wellington (New Zealand)
M. Delower H. Bhuiyan, Industrial Research Ltd. (New Zealand)
Gerald J. Smith, Victoria Univ. of Wellington (New Zealand)
Andrew J. Kay, Industrial Research Ltd. (New Zealand)
Koen Clays, Katholieke Univ. Leuven (Belgium)

Published in SPIE Proceedings Vol. 7722:
Organic Photonics IV
Paul L. Heremans; Reinder Coehoorn; Chihaya Adachi, Editor(s)

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