Global Raman Imaging

Global Raman imaging can be a fast and simple technique, providing high lateral spatial resolution (down to the diffraction limit corresponding with the excitation laser wavelength) images of the sample of interest. There are several techniques available. 

Figure 3 Global Raman imaging Experimental setup and example image of a silicon wafer with letter E printed on it. Image taken at 520 cm 1 (Silicon Raman mode).

Figure 10 Global Raman image of PTFE distribution in PA-matrix image taken at 731 cm- Left white light micrograph center Raman image right the same image after image enhancement and edge detection.

Two alternative methods of Raman imaging via global illumination and via point illumination in combination with confocal light collection were applied to the study of heterogeneous polymer systems. The spectral and spatial resolving power of the different techniques was estimated experimentally. The influence of the depth resolution on the Raman image of a defined sample structure was demonstrated in a mathematical simulation. Data are given for PE, PS, polyacrylate, and epoxy resins. 23 refs. 

Markwot, L., et al., Raman imaging of heterogeneous polymers A comparison of global versus point... 

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