Focused terahertz waves generated by a phase velocity gradient in a parallel-plate waveguide

Robert W. McKinney, Yasuaki Monnai, Rajind Mendis, Daniel Mittleman

研究成果: Article査読

12 被引用数 (Scopus)

抄録

We demonstrate the focusing of a free-space THz beam emerging from a leaky parallel-plate waveguide (PPWG). Focusing is accomplished by grading the launch angle of the leaky wave using a PPWG with gradient plate separation. Inside the PPWG, the phase velocity of the guided TE1 mode exceeds the vacuum light speed, allowing the wave to leak into free space from a slit cut along the top plate. Since the leaky wave angle changes as the plate separation decreases, the beam divergence can be controlled by grading the plate separation along the propagation axis. We experimentally demonstrate focusing of the leaky wave at a selected location at frequencies of 100 GHz and 170 GHz, and compare our measurements with numerical simulations. The proposed concept can be valuable for implementing a flat and wide-aperture beam-former for THz communications systems.

本文言語English
ページ(範囲)27947-27952
ページ数6
ジャーナルOptics Express
23
21
DOI
出版ステータスPublished - 2015 10 19

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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