Transmission terahertz waveguide-based imaging below the diffraction limit

Awad, M. M.; Cheville, R. A.
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p221107
Academic Journal
Using a terahertz line source from a near dispersion-free parallel plate waveguide, we demonstrate broad bandwidth imaging at terahertz frequencies with subwavelength image resolution. Terahertz radiation is coupled into a parallel plate waveguide with a 100 μm plate spacing, which serves as the imaging aperture. The image data are collected as projections and the final image is reconstructed using the filtered back-projection algorithm, similar to that in x-ray computed tomography. Images taken using a waveguide-based line source demonstrate higher resolution than can be achieved using a confocal cylindrical lens setup.


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