Second-order nonlinear polarizability of Push-Pull chromophores. A decade of progress in donor-π-acceptor materials

Fine tuning and switching of nonlinear optical response of ferrocene chromophores has been an area of considerable significance as evidenced by a large number of reports in the current literature. In this personal account, we present linear/nonlinear behavior and structure-activity relationships of several classes of donor-pi-acceptor designs using organometallic and organic materials, developed by our research group during the last decade. The results especially the electronic absorption spectral and the hyper-Rayleigh scattering have been supported by theoretical calculations. Exploiting the redox behavior of ferrocene donor, we have demonstrated switching of quadratic nonlinear optical responses with reversible redox chemistry, which is a useful attribute of nonlinear optical materials. Based on the ease in synthesis, structure diversification and structure-based large and switchable second-order optical nonlinearity, these materials are potential candidates for electro-optic applications.

Automated summary

Fine tuning and switching of the nonlinear optical response of ferrocene chromophores is an important area of research. This personal account focuses on the linear/nonlinear behavior and structure-activity relationships of donor-pi-acceptor designs using both organometallic and organic materials. Experimental results, supported by theoretical calculations, show the potential of these materials for electro-optic applications due to their ease of synthesis, structure diversification, and switchable second-order optical nonlinearity.