Organic 3rd order NLO materials (opto-optic)

Third order nonlinear optical effects involve the interaction of one or more light beams affecting the amplitude and/or phase of another light beam, or even generating a beam at a different frequency.  Highly nonlinear polymer waveguide devices offer the possibility of major advances in optical signal processing and development of parametric amplifiers. We have developed a simple optical arrangement for phase sensitive detection of degenerate four-wave mixing (DFWM) to characterize the real and imaginary parts of the third order nonlinear susceptibility χ(3) using an imaged 2-D phase grating.




Degenerate four wave mixing setup for measuring the complex third order nonlinear susceptibility in thin films



“Measurement of complex
χ(3) using degenerate four-wave mixing with an imaged 2-D phase grating,” Shuo-Yen Tseng, Weilou Cao, Yi-Hsing Peng, Joel M. Hales, San-Hui Chi, Joseph W. Perry, Seth R. Marder, Chi H. Lee, Warren N. Herman, and Julius Goldhar, Optics Express 14, 8737(2006).

“Phase-matched and phase-mismatched degenerate four-wave mixing for measuring complex of nonlinear thin polymer films,” Weilou Cao, Yi-Hsing Peng, Chi H. Lee, Warren N. Herman, and  Julius Goldhar,  ACS Organic Thin Films for Photonics Applications Symposium, August 2008, Philadelphia.

 “Phase scan technique for measuring phase of the complex χ(3) of nonlinear polymer thin films,” Weilou Cao, Yi-Hsing Peng, Yongzhang Leng, Chi H. Lee, Warren N. Herman, and Julius Goldhar, in Organic Thin Films for Photonics Applications,  W.N. Herman, S. Flom, and S. Foulger, eds. (ACS Symposium Series 1039, 2010), Chap. 10.