External amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devices

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dc.contributor.authorKindness, S. J.
dc.contributor.authorJessop, D. S.
dc.contributor.authorWei, B.
dc.contributor.authorWallis, R.
dc.contributor.authorKamboj, Varun S.
dc.contributor.authorXiao, L.
dc.contributor.authorRen, Y.
dc.contributor.authorBraeuninger-Weimer, P.
dc.contributor.authorAria, Adrianus Indrat
dc.contributor.authorHofmann, S.
dc.contributor.authorBeere, H. E.
dc.contributor.authorRitchie, David A.
dc.contributor.authorDegl’Innocenti, R.
dc.date.accessioned2017-09-05T10:44:17Z
dc.date.available2017-09-05T10:44:17Z
dc.date.issued2017-08-09
dc.description.abstractActive control of the amplitude and frequency of terahertz sources is an essential prerequisite for exploiting a myriad of terahertz applications in imaging, spectroscopy, and communications. Here we present a optoelectronic, external modulation technique applied to a terahertz quantum cascade laser which holds the promise of addressing a number of important challenges in this research area. A hybrid metamaterial/graphene device is implemented into an external cavity set-up allowing for optoelectronic tuning of feedback into a quantum cascade laser. We demonstrate powerful, all-electronic, control over the amplitude and frequency of the laser output. Full laser switching is performed by electrostatic gating of the metamaterial/graphene device, demonstrating a modulation depth of 100%. External control of the emission spectrum is also achieved, highlighting the flexibility of this feedback method. By taking advantage of the frequency dispersive reflectivity of the metamaterial array, different modes of the QCL output are selectively suppressed using lithographic tuning and single mode operation of the multi-mode laser is enforced. Side mode suppression is electrically modulated from ~6 dB to ~21 dB, demonstrating active, optoelectronic modulation of the laser frequency content between multi-mode and single mode operation.en_UK
dc.identifier.citationKindness SJ, Jessop DS, Wei B, et al. External amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devices. Scientific Reports, Volume 7, August 2017, Article number 7657en_UK
dc.identifier.cris18193865
dc.identifier.issn2045-2322
dc.identifier.urihttp://dx.doi.org/10.1038/s41598-017-07943-w
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/12439
dc.language.isoenen_UK
dc.publisherNature Publishing Groupen_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleExternal amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devicesen_UK
dc.typeArticleen_UK

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