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A Luneburg lens for the THz region (Conference Presentation)
Author(s): Yasith Amarasinghe; Daniel M. Mittleman; Rajind Mendis
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Paper Abstract

Various Luneburg-lens geometries are used in the microwaves industry as radar reflectors and omnidirectional antennas. Here, we implement a two-dimensional Luneburg lens for the THz frequency region using a waveguide-based artificial-dielectric technology. The cylindrical device has a parabolic shaped top surface and a flat bottom surface. The substrate material of the lens is ultra-pure Teflon, with the top and bottom surfaces coated with high-conductivity silver paint to form a quasi-parallel-plate waveguide. Our experimental results show that the lens can focus an approximately 2-cm diameter input beam to a spot size of 3.4 mm at the diametrically opposite edge, at an operating frequency of 0.162 THz. This work demonstrates the versatility of this artificial-dielectric technology to design and fabricate inhomogeneous, gradient-index devices for the THz region.

Paper Details

Date Published: 14 May 2019
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Proc. SPIE 10983, Next-Generation Spectroscopic Technologies XII, 1098316 (14 May 2019); doi: 10.1117/12.2520476
Show Author Affiliations
Yasith Amarasinghe, Brown Univ. (United States)
Daniel M. Mittleman, Brown Univ. (United States)
Rajind Mendis, Brown Univ. (United States)


Published in SPIE Proceedings Vol. 10983:
Next-Generation Spectroscopic Technologies XII
Richard A. Crocombe; Luisa T.M. Profeta; Abul K. Azad, Editor(s)

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