P. Matousek, identified by the Central Laser Facility as Pavel Matousek, developed spatially offset Raman spectroscopy for chemical measurements through diffusely scattering material. His institutional profile also describes work on optical parametric chirped pulse amplification and rejection of fluorescence in Raman spectroscopy.[ref]
Pavel Matousek by the Central Laser Facility. staff profile, scientific contributions
The 2005 team measured a buried trans-Stilbene layer below of Poly(methyl methacrylate) powder. The reported 19-fold contrast improvement concerned the buried layer's spectral visibility; it did not mean that the sample emitted 19 times as many Raman photons.[ref]
Subsurface Probing in Diffusely Scattering Media Using Spatially Offset Raman Spectroscopy by P. Matousek and others. Abstract, sample and unprocessed contrast result
For an original contrast example, a collection arrangement yielding 100 surface counts and 10 buried-layer counts has a buried-to-surface ratio . Another arrangement yielding 10 surface counts and 4 buried-layer counts has ratio . The ratio improves fourfold although the buried-layer count decreases. This illustrates why a collection geometry can make chemical identification easier without increasing absolute signal. Whether the second measurement is more precise also depends on noise, collection duration and background.
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