[CCoE Notice] Today's Seminar * October 21, 2011 * Steven Baldelli * University of Houston

[Lewis, Lindsay R]

 ***** Seminar *****
Center for Integrated Bio and Nano Systems
Houston Chapter of IEEE Nanotechnology Council and Houston Chapter of IEEE Magnetics Society
Friday, October 21, 2011
12:30 p.m. (Refreshments served at noon)
Room: W122 Building D3

Sum Frequency Generation Microscopy

Steven Baldelli

Chemistry, University of Houston, Houston, TX

A new sum frequency generation (SFG) imaging microscope using a novel sampling theory, compressive sensing (CS), has been developed for surface studies. CS differentiates itself from the conventional sampling methods by collecting fewer measurements than the traditional methods to reconstruct a high quality image. Pseudorandom patterns were applied to a light modulator and reflected the sum frequency (SF) signal generated from the sample, and directed into a photomultiplier tube (PMT) detector. The image of the sample was reconstructed using sparsity preserving algorithms from the SF signal. The influences of the number of CS testing patterns applied and the number of SF pulses acquired for each pattern on the quality of the images was investigated and a comparison of the image quality with the traditional raster scan was made at varying resolutions for a gold patterned Si surface. Our results demonstrate the CS technique achieved sixteen times the pixel density beyond the resolution where the raster scan strategy lost its ability to image the sample due to the dilution of the SF signal below the detection limit of the detector.

Bio of Prof. Baldelli:

Steve Baldelli received his B.S. degree from Framingham State College in Massachusetts in 1992 and his Ph.D. from Tufts University in 1998 under the direction of Mary Shultz. After spending three years at the University of California, Berkeley, with Gabor Somorjai and Phil Ross, he moved to University of Houston, where he is now an associate professor of chemistry. He is also a visiting professor at the Royal Institute of Technology in Stockholm, Sweden. His interests center on using linear and nonlinear spectroscopic and microscopic methods to study surface chemistry problems including liquid and solid interfaces of ionic liquids, SAMs, electrochemical interfaces, and problems in corrosion.

Contact Prof. Jiming Bao (jbao at uh.edu<mailto:jbao at uh.edu>) if you would like to arrange for a time to meet with Prof. Baldelli.

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