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We experimentally demonstrate a two-dimensional Luneburg lens for the THz region using a waveguide-based artificial-dielectric medium. The substrate material of the lens is Teflon with the top and bottom surfaces… Click to show full abstract
We experimentally demonstrate a two-dimensional Luneburg lens for the THz region using a waveguide-based artificial-dielectric medium. The substrate material of the lens is Teflon with the top and bottom surfaces coated with silver to form a quasi-parallel-plate waveguide. The top surface of the device has a curved conical profile and the bottom surface is flat. The lens can focus an approximately 2-cm diameter input beam at a frequency of 0.162 THz to a spot size of 3.4 mm (less than 2λ) at the diametrically opposite edge of the device.
Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves
Year Published: 2019
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