Rapid nonlinear optical polarization measurements by Nonlinear Optical Stokes Ellipsometery

ANYL 467

Nathan Begue, nbegue@purdue.edu and Garth J. Simpson, gsimpson@purdue.edu. Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907
Use of second harmonic generation (SHG) to examine surface interfacial regions has been carried out for systems that lack inversion symmetry. Such measurements have required a lengthy acquisition time, thus eliminating dynamic systems as possible samples. By increasing the repetition rate of the laser system and replacing previously slow rotating polarization optics with a rapid photoelastic modulator the acquisition time with full polarization analysis has been reduced from several hours to less than a second. Nonlinear Optical Stokes Ellipsometery (NOSE) has be run on several dyes, crystalline films of sugars and amino acids and have resulted in Χ(2) tensors with an order of magnitude more precision than previous measurements in a fraction of the time required for previous measurements.
 

Analytical Approaches
1:30 PM-4:30 PM, Thursday, August 23, 2007 BCEC -- 104A, Oral

Division of Analytical Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007