Synthesis and properties of zwitterionic nonlinear optical chromophores with large hyperpolarizability for poled polymer applications

Beaudin, A.M.R.; Song, N.H.; Bai, Y.W.; Men, L.Q.; Gao, H.P.; Wang, Z.Y.; Szablewski, M.; Cross, G.H.; Wenseleers, W.; Campo, J.; Goovaerts, E.

Abstract

The electric-field-dependent change in refractive index in nonlinear optical (NLO) materials can be utilized for electrical-to-optical signal conversion, such as fast electrooptic (EO) modulators needed in optical telecommunication. Compared to inorganic NLO crystals (e.g., LiNbO3), organic NLO materials offer advantages such as higher EO coefficients, lower dielectric constants, and good processibility. To obtain a large EO response, chromophores with a high molecular nonlinearity (hyperpolarizability ) need to be oriented to form a macroscopically noncentrosymmetric material. For chromophores with a large dipole moment (), one way to achieve such a polar ordering is by electric-field poling of the chromophores in a polymer matrix. Consequently, the main figure of merit describing the performance of NLO chromophores in such EO polymer applications is the scalar product . Among many types of organic NLO chromophores, zwitterionic derivatives of 7,7,8,8-tetracyanoquinodimethane (TCNQ) such as (Z)-4-[1-cyano-3-(diethylamino)-2-propenylidene]-2,5-cyclohexadiene-1-ylidenepropanedinitrile (DEMI; Figure 1) are known to possess very high molecular hyperpolarizabilities and show the largest values reported to date

Citation

Beaudin, A., Song, N., Bai, Y., Men, L., Gao, H., Wang, Z., …Goovaerts, E. (2006). Synthesis and properties of zwitterionic nonlinear optical chromophores with large hyperpolarizability for poled polymer applications. Chemistry of Materials, 18(5), 1079-1084. https://doi.org/10.1021/cm051758q+s0897-4756%2805%2901758-8

• Journal Article Type: Article
• Publication Date: Mar 1, 2006
• Deposit Date: Jul 16, 2007
• Journal: Chemistry of Materials
• Print ISSN: 0897-4756
• Electronic ISSN: 1520-5002
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 5
• Pages: 1079-1084
• DOI: https://doi.org/10.1021/cm051758q+s0897-4756%2805%2901758-8
• Public URL: https://durham-repository.worktribe.com/output/1581799