 Fig. 2. Polarization-sensitive 2D angular patterns obtained by a fiber-optic two-dimensional scattering (FITS) system (Zhu Y et al 2010), here measuring light scattered by two layers of a tissue phantom containing, respectively, 6μm (panels cd) and 10μm, (panels ef) polystyrene microspheres. This system can measure depth-resolved scattering in two angular dimensions by using Fourier-domain low coherence interferometry (LCI). The key feature of FITS is its full control of polarization of both the illumination and backscattered light, which allows 2D angular scattering measurements. Panels cd and ef show p- and s-polarized 2D scattered light patterns for the 6μm and 10μm microsphere layers, respectively, all for the p-polarized illumination. These measurements agree with Mie theory simulations (panels gh and ij). Lines A, B indicate directions along which the Mie theory simulations are fitted to data for estimation of particle size by using the 1D angle-resolved LCI approach (for example, Zhu Y et al 2009). Note that the FITS system allows one to perform such analysis along other directions, for example, line C, by using a light scattering theory for nonspherical particles. This can yield not only the size of the particles but also their aspect ratio. The figure redrawn by permission from Zhu Y et al 2010 with modification. The panel identifications are the same as those of the original figure. Image: courtesy of YZ. [YZ, MGG, AW] |
