Comparison of coherent and spontaneous Raman microspectroscopies for noninvasive detection of single bacterial endospores.
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.
Petrov
Georgi I
GI
Department of Physics, University of Wisconsin, P.O. Box. 413, Milwaukee, WI 53201, USA.
Arora
Rajan
R
Yakovlev
Vladislav V
VV
Wang
Xi
X
Sokolov
Alexei V
AV
Scully
Marlan O
MO
D017785:Photons; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013171:Spores, Bacterial / Q000737:chemistry*; D041623:Tomography, Optical Coherence / Q000379:methods*