Figure 4 | Scientific Reports

Figure 4

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

Figure 4

THz pulsed spectroscopy ex vivo of the Corpus callosum from the porcine brain ex vivo. (a) Schematic of the THz measurements of brain tissues, sandwiched between the two HRFZ-Si windows of a cuvette. Here axons are perpendicular to the THz beam axis. (b) H&E-stained histology of the Corpus callosum from the porcine brain, with axons packed in an almost perfect hexagonal lattice. (c, d) THz refractive index n and absorption coefficient \(\alpha \) (by field) of the Corpus callosum, for the THz field \(\textbf{E}\) oriented collinearly and transversely to axons. The error bars represent the data reproducibility. (e) Gaussian fits for the refractive index n at 0.6 THz of the Corpus callosum at the two polarizations.

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