Figure 4 | Scientific Reports

Figure 4

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

Figure 4The alternative text for this image may have been generated using AI.

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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