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TitleOptimizing the second-order nonlinear optical response in some indoline based chromophores at the molecular and macroscopic levels
Publication TypeConference Paper
Year of Publication2011
AuthorsTeshome, A., Bhuiyan M.D.H., Ashraf M., Gainsford G.J., Kay A.J., Van Cleuvenbergen S., Asselberghs I., and Clays K.
Conference NameProceedings of SPIE - The International Society for Optical Engineering
Date Published2011
KeywordsAzo dyes, Chromophores, Corona poling, Dipolar chromophores, Hyper Rayleigh scattering, Hyper-polarizability, Nonlinear optics, Polymer films, Rayleigh scattering, Second order nonlinear optics
AbstractThe effect of extending the conjugation length, the deployment of various substituents and configurational locking of the polyene backbone on the second-order nonlinear optical (NLO) response of a series of indoline based compounds has been investigated. The compounds were examined using Hyper-Rayleigh scattering (HRS) and relative second-harmonic generation (SHG) techniques with a femtosecond operating system with a 1300 nm fundamental wavelength. All of the compounds were found to have high molecular hyperpolarizabilities with β values of up to 1230 × 10-30 esu. At the macroscopic level - for poled polymer thin films - a strong second-order NLO signal has been detected and d33 values of up to 217 pm/V are found - a response of some ten times greater than that found for the well known azo dye Disperse Red 1. © 2011 SPIE.

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