V. Giliberti; M. Flammini; C. Ciano; E. Pontecorvo; E. Del Re; M. Ortolani
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10383/103830P/Super-resolved-terahertz-microscopy-by-knife-edge-scan/10.1117/12.2273796.short
We present a compact, all solid-state THz confocal microscope operating at 0.30 THz that achieves super-resolution by using the knife-edge scan approach. In the final reconstructed image, a lateral resolution of 60 μm ≈ λ/17 is demonstrated when the knife-edge is deep in the near-field of the sample surface. When the knife-edge is lifted up to λ/4 from the sample surface, a certain degree of super-resolution is maintained with a resolution of 0.4 mm, i.e. more than a factor 2 if compared to the diffraction-limited scheme. The present results open an interesting path towards super-resolved imaging with in-depth information that would be peculiar to THz microscopy systems.
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