A Luneburg lens for the THz region (Conference Presentation)

Yasith Amarasinghe; Daniel M. Mittleman; Rajind Mendis

doi:10.1117/12.2520476

14 May 2019 A Luneburg lens for the THz region (Conference Presentation)

Yasith Amarasinghe, Daniel M. Mittleman, Rajind Mendis

Author Affiliations +

Proceedings Volume 10983, Next-Generation Spectroscopic Technologies XII; 1098316 (2019) https://doi.org/10.1117/12.2520476
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

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.

Conference Presentation

Citation Download Citation

Yasith Amarasinghe, Daniel M. Mittleman, and Rajind Mendis "A Luneburg lens for the THz region (Conference Presentation)", Proc. SPIE 10983, Next-Generation Spectroscopic Technologies XII, 1098316 (14 May 2019); https://doi.org/10.1117/12.2520476

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