In a two-layer diffusing medium, polarized light directly backscattering off the superficial layer will partially retain its sense of polarization, whereas deeper-probing light will be increasingly depolarized by diffusion. This effect has been studied in both elastic scattering and fluorescence contexts. We apply this method to Raman scattering in two two-layer models with a highly diffusing lower layer of glucose powder and an upper layer of either clear plastic or chicken skin. We employ detection of orthogonal polarization states to generate a Raman spectrum of only the superficial layer by combining the orthogonal signals.
© 2005 Optical Society of America
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(170.6930) Medical optics and biotechnology : Tissue
Zachary J. Smith and Andrew J. Berger, "Surface-sensitive polarized Raman spectroscopy of biological tissue," Opt. Lett. 30, 1363-1365 (2005)