A new surface microscope, compressive sensing sum frequency generation microscope (CS-SFG), is developed to study the Langmuir�Blodgett monolayer on solid and liquid substrate together with Brewster Angle Microscope (BAM). Compared to the traditional sum-frequency generation microscope, the new method, compressive sensing (CS), enables the use of a �single pixel detector� such as a photomultiplier tube (PMT) or a photodiode instead of the CCD or CMOS chips to obtain images in a unique and efficient manner. More than the traditional advantages of SFG microscope, which has highly surface specific and allows the operation in ambient conditions for various interfaces with both vibrational spectroscopy and the orientation of the functional groups information, the new CS-SFG can reconstruct the imaging by smaller number of measurement and highly increase the resolution by signal dilution. Furthermore, as single pixel detector, such as PMT, can be used in CS-SFG to capture the weak nonlinear SF signal and chemically image, it possible to get the image with high efficiency and less image distortion from dark noise and read-out noise, and therefore, with better quality. Brewster Angle Microscope has good surface selectivity and flexibility in different system. Different from SFG, which resolution comes from Fresnel coefficient, BAM provides more information about the refraction index difference. Using BAM together with CS-SFG could get the chemical imaging on the surface more comprehensively, and better analyzing the properties of surface molecules and chemical process.

Development of compressive sensing-sum frequency generation microscope

248th National Meeting (2014)

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