We combined sum-frequency generation (SFG) vibrational spectroscopy with coherent anti-Stokes Raman scattering (CARS) spectroscopy in one system to examine both surface and bulk structures of materials with the same geometry and without the need to move the sample. Poly(methyl methacrylate) (PMMA) and polystyrene (PS) thin films were tested before and after plasma treatment. The sensitivities of SFG and CARS were tested by varying polymer film thickness and using a lipid monolayer.
© 2011 Optical Society of America
Original Manuscript: January 18, 2011
Revised Manuscript: March 11, 2011
Manuscript Accepted: April 28, 2011
Published: June 10, 2011
Chi Zhang, Jie Wang, Alexander Khmaladze, Yuwei Liu, Bei Ding, Joshua Jasensky, and Zhan Chen, "Examining surface and bulk structures using combined nonlinear vibrational spectroscopies," Opt. Lett. 36, 2272-2274 (2011)