A Luneburg Lens for the Terahertz Region
| Autor: | Rajind Mendis, Daniel M. Mittleman, Yasith Amarasinghe |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Waveguide (electromagnetism) Radiation Materials science business.industry Terahertz radiation Conical surface Edge (geometry) Luneburg lens Condensed Matter Physics 01 natural sciences law.invention 010309 optics Lens (optics) Optics law 0103 physical sciences Electrical and Electronic Engineering business Instrumentation Artificial dielectrics Beam (structure) |
| Zdroj: | Journal of Infrared, Millimeter, and Terahertz Waves. 40:1129-1136 |
| ISSN: | 1866-6906 1866-6892 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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