Mr. Yasith Amarasinghe Profile

Yasith Amarasinghe

at Brown Univ

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Proceedings Article | 14 May 2019 Presentation

A Luneburg lens for the THz region (Conference Presentation)

Yasith Amarasinghe, Daniel Mittleman, Rajind Mendis

Proceedings Volume 10983, 1098316 (2019) https://doi.org/10.1117/12.2520476

KEYWORDS: Terahertz radiation, Waveguides, Microwave radiation, Radar, Reflectors, Antennas, Silver

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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.

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