Terahertz imaging system based on a backward-wave oscillator

Dobroiu, Adrian; Yamashita, Minoru; Ohshima, Yuichi N.; Morita, Yasuyuki; Otani, Chiko; Kawase, Kodo

doi:10.1364/ao.43.005637

Cited by 226 publications

(109 citation statements)

References 17 publications

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“…However, other techniques such as the finite difference time domain (FDTD) method should help clarify the expected behaviour. The lateral shift predicted in the case of reflection of a finite beam off an antiferromagnet should in principle be measurable given a suitable coherent source such as a far infrared laser (Rosenbluh et al, 1976), backward wave oscillator (Dobroiu et al, 2004), or YIG oscillator with frequency multiplied output (Kurtz et al, 2005). In order to observe the normal incidence shift, a beam splitting arrangement appears necessary.…”

Section: Conclusion and Future Prospectsmentioning

confidence: 99%

Nonreciprocal Phenomena on Reflection of Terahertz Radiation off Antiferromagnets

Dumelow¹,

Costa²,

Lima³

et al. 2010

Recent Optical and Photonic Technologies

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Section: Conclusion and Future Prospectsmentioning

confidence: 99%

Nonreciprocal Phenomena on Reflection of Terahertz Radiation off Antiferromagnets

Dumelow¹,

Costa²,

Lima³

et al. 2010

Recent Optical and Photonic Technologies

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“…4), a series of time domain scans were taken moving the knife in the x-direction to partially obscure the beam as described in Section 2. The expected behaviour of the intensity of the THz beam against x position, assuming a Gaussian distribution, is expected to take the form of an error function [38].…”

Section: Titanium Sapphire Amplifier Pumped Focusing Experimental Resmentioning

confidence: 99%

Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

Carthy

Gow

Berry

et al. 2017

J Infrared Milli Terahz Waves

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We show that, when large-area multiplex terahertz semiconductor emitters, that work on diffusion currents and Schottky potentials, are illuminated by ultrashort optical pulses they can radiate a directional electromagnetic terahertz pulse which is controlled by the angular spectrum of the incident optical beam. Using the lens that focuses the incident near-infrared pulse, we have demonstrated THz emission focusing in free space, at the same point where the optical radiation would focus. We investigated the beam waist and Gouy phase shift of the THz emission as a function of frequency. We also show that the polarization profile of the emitted THz can be tailored by the metallic patterning on the semiconductor, demonstrating radial polarization when a circular emitter design is used. Our techniques can be used for fast THz beam steering and mode control for efficiently coupling to waveguides without the need for THz lenses or parabolic mirrors.

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“…In the case of a Gaussian beam cut in the vertical direction, y, the signal takes the form of a S-curve error function [34],…”

Section: Incident Beam Profilementioning

confidence: 99%

Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

et al. 2016

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Enhanced terahertz transmission through bullseye plasmonics lenses fabricated using micromilling techniques Heggie, Tanner J.; Naylor, David A.; Gom, Brad G.; Bordatchev, Evgueni; Trimboli, M. Grace http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277263&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277263&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1007/s11468-015-0152-7 Abstract Imaging applications at terahertz frequencies are, in general, limited to relatively low spatial resolution due to the effects of diffraction. By using a subwavelength aperture in the near-field, however, it is possible to achieve subwavelength resolution, although low transmission through the aperture limits the sensitivity of this approach. Plasmonic lenses in the form of bullseye structures, which consist of a circular subwavelength aperture surrounded by concentric periodic corrugations, have demonstrated enhanced transmission, thereby increasing the utility of near-field imaging configurations. In this paper, the design, fabrication, and experimental performance of plasmonic lenses optimized for 300 GHz are discussed. While nanofabrication techniques are required for optical applications, microfabrication techniques are sufficient for terahertz applications. The process flow for fabricating a double-sided bullseye structure using a precision micromilling technique is described. Transmission and beam profile measurements using a customized t...

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Terahertz imaging system based on a backward-wave oscillator

Cited by 226 publications

References 17 publications

Nonreciprocal Phenomena on Reflection of Terahertz Radiation off Antiferromagnets

Nonreciprocal Phenomena on Reflection of Terahertz Radiation off Antiferromagnets

Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

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