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

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dc.citation.firstpage27947en_US
dc.citation.issueNumber21en_US
dc.citation.journalTitleOptics Expressen_US
dc.citation.lastpage27952en_US
dc.citation.volumeNumber23en_US
dc.contributor.authorMcKinney, Robert W.en_US
dc.contributor.authorMonnai, Yasuakien_US
dc.contributor.authorMendis, Rajinden_US
dc.contributor.authorMittleman, Danielen_US
dc.date.accessioned2016-04-01T20:24:37Zen_US
dc.date.available2016-04-01T20:24:37Zen_US
dc.date.issued2015en_US
dc.description.abstractWe 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 TE1ļ¾ 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.en_US
dc.identifier.citationMcKinney, Robert W., Monnai, Yasuaki, Mendis, Rajind, et al.. "Focused terahertz waves generated by a phase velocity gradient in a parallel-plate waveguide." <i>Optics Express,</i> 23, no. 21 (2015) Optical Society of America: 27947-27952. http://dx.doi.org/10.1364/OE.23.027947.en_US
dc.identifier.doihttp://dx.doi.org/10.1364/OE.23.027947en_US
dc.identifier.urihttps://hdl.handle.net/1911/88824en_US
dc.language.isoengen_US
dc.publisherOptical Society of Americaen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleFocused terahertz waves generated by a phase velocity gradient in a parallel-plate waveguideen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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