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Proc Natl Acad Sci U S A. 2007 May 8;104(19):7776-9. Epub 2007 May 1.

Comparison of coherent and spontaneous Raman microspectroscopies for noninvasive detection of single bacterial endospores.

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  • 1Department of Physics, University of Wisconsin, P.O. Box. 413, Milwaukee, WI 53201, USA.


Single bacterial spores were analyzed by using nonlinear Raman microspectroscopy based on coherent anti-Stokes Raman scattering (CARS). The Raman spectra were retrieved from CARS spectra and found to be in excellent agreement with conventionally collected Raman spectra. The phase retrieval method based on maximum entropy model revealed significant robustness to external noise. The direct comparison of signal amplitudes exhibited a factor of 100 stronger CARS signal, as compared with the Raman signal.

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