| Title | Second-order nonlinear optical properties of zwitterionic chromophores |
| Publication Type | Conference Paper |
| Year of Publication | 2010 |
| Authors | Teshome, A., Asselberghs I., Clarke D.J., Middleton A.P., Bhuiyan M.D.H., Smith G.J., Kay A.J., and Clays K. |
| Conference Name | Proceedings of SPIE - The International Society for Optical Engineering |
| Date Published | 2010 |
| Keywords | Chromophores, Dimethylformamide, Hyper Rayleigh scattering, merocyanine, Molecular hyperpolarizabilities, Molecules, Nonlinear optics, Optical materials, Optical properties, Organic solvents, Rayleigh scattering, Second order nonlinear optics, Solvent polarity |
| 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. © 2010 SPIE. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-77954411159&partnerID=40&md5=f550412565139f48ae4f23d826b70d70 |
| DOI | 10.1117/12.854664 |
