Gated Raman Spectroscopy

Depth Probing with Kerr-Gated Raman Spectroscopy... 

The possibilities of time-resolved laser based spectroscopies have been demonstrated, combining such techniques as luminescence, Raman, breakdown and second-harmonic generation. New type of luminescence excitation mechanism. Plasma Induced Luminescence, was found. UV Gated Raman spectroscopy proved to be an effective tool for minerals Raman detection on the strong luminescence background. 

S.B. Cronin, R. Barnett, M. Tinkham, S.G. Chou, O. Rabin, M.S. Dresselhaus, A.K. Swan, M.S. Unlu, and B.B. Goldberg, Electrochemical gating of individual single-wall carbon nanotubes observed by electron transport measurements and resonant Raman spectroscopy. Appl. Phys. Lett. 84, 2052—2054 (2004). 

This section will outline the developments of deep Raman spectroscopy from the use of time gating to spatially offset Raman spectroscopy to transmission Raman a sequence of increasing practical probing depth as advances have been made. This is counterbalanced by a reduction in depth selectivity with each new technique. An exploration of the potential use of deep Raman for breast cancer diagnostics will be used to illustrate the potential here. 

The Kerr-gated Raman concept proved to be effective, although the complexity and high peak intensities involved in these experiments precluded its wider use. These Hmitations were lifted by the subsequent development of the spatial concepts for deep, noninvasive spectroscopy. 

Barsberg, S., P. Matusek, M. Towrie, H. Jprgensen, and C. Felby. 2006. Lignin radicals in the plant cell wall prohed hy Kerr-gated resonance raman spectroscopy. Biophys. J. 90 2978-2986. 

Ag and Pt. The back gating is through the Au metal electrode. The setup is placed under the Raman spectrometer to achieve in situ Raman spectroscopy. (Figure is from Ref [39].)... 

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