Figure 3 | Scientific Reports

Figure 3

From: Quantitative polarization-sensitive super-resolution solid immersion microscopy reveals biological tissues’ birefringence in the terahertz range

Figure 3

Polarization-sensitive 0.6 THz (\(\lambda = 500\) µm) SI microscopy of the rat brain ex vivo. (a, b) Photo and H&E-stained histology of the brain, where an imaged area is pointed out, along with three areas of interest—i.e., the Corpus callosum (I), Cortex (II), and Corpus striatum (III). (c, d) THz images of the rat brain for the two orthogonal orientations of the THz-beam polarization \(\textbf{E}_{\text{INC}}\) in the imaging plane, which are collinear and transverse to axons in the Corpus callosum. (e, f) THz refractive index distributions n over the imaging area for the polarizations. (g–i) Histograms for the THz refractive indices of the brain areas I, II, and III, respectively, where (g) shows significant THz birefringence of the Corpus callosum, when the THz field \(\textbf{E}_{\text{INC}}\) is collinear and transverse to axons.

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