Organic 2nd order NLO materials (electro-optic)

The electro-optic (EO) effect is a nonlinear optical (NLO) effect that involves a change in the refractive index of a material in response to an electric field that varies slowly in comparison to the frequency of light. The ability to modify the refractive index of a material by an applied voltage (which produces the field) leads to useful devices such as optical modulators and switches.  Poled polymers are a class of photonic material that may substitute for inorganic nonlinear crystals in high speed optical communication, signal processing, and optical control of radar applications because they exhibit larger EO coefficients and perform better at higher modulation frequencies.


Examples of state of the art chromophores developed at the
University of Washington and evaluated at LPS in support of the
DARPA MORPH program.


“Analysis of multiple reflection effects in reflective measurements of electro-optic coefficients of poled polymers in multilayer structures,” D. H. Park, C. H. Lee, and W. N. Herman, Optics Express 14, 8866(2006).

“Ultralarge and Thermally Stable Electro-Optic Activities from Supramolecular Self-Assembled Molecular Glasses,” Tae-Dong Kim, Jae-Wook Kang,  Jingdong Luo,  Sei-Hum Jang, Jae-Won Ka,  Neil Tucker, Jason B. Benedict, Larry R. Dalton, Tomoko Gray, Rene´ M. Overney, Dong Hun Park, Warren N. Herman and Alex K.-Y. Jen, J. Am. Chem. Soc. Communications 129, 488(2007)

“Electro-optic polymeric films of phenylethynyl dyes with transparency in the blue region of the visible spectrum,” G.A. Lindsay, M.C. Davis, A. P. Chafin, S. Fallis, R.C. Hoffman, T.M. Pritchett, J. Andzelm, A.M. Rawlett, D. Park, W. N. Herman, Optical Materials 32, 302(2009).