Fig. 1
From: Double Stokes polarimetric microscopy for chiral fibrillar aggregates
DSP experimental setup and RTT sample maps of the orientation \(\delta\)-dependent parameters. The scheme of the DSP measurement is shown in (a) (PSG - polarimetric state generator, PSA - polarimetric state analyzer, LP - linear polarizer, HWP - half-wave plate, QWP - quarter-wave plate). The laboratory reference frame XYZ is presented in (a, b) and the molecular reference frame xyz is shown in (a) together with the fiber. A collagen fiber is shown in the laboratory frame coordinate system (b) with indicated \(\alpha\) and \(\delta\) angles. The maps of the \(\delta\)-dependent polarimetric parameters A (c, g), B (d, h), \(SHG_{LD}\) (e, i), and \(SHG_{45}\) (f, j) are shown for the longitudinal (c-f) and oblique cuts (g-j). The \(\delta\) orientation maps calculated from A (l, p), B (m, r) and obtained from the PIPO fits (n, s) are shown for the longitudinal (l-n) and oblique (p-s) cuts. For reference, the polarization-independent SHG intensity images are obtained for the longitudinal (k) and oblique (o) cuts by summing all 36 polarization measurements used for DSP.
