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

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dc.contributor.author Kindness, S. J.
dc.contributor.author Jessop, D. S.
dc.contributor.author Wei, B.
dc.contributor.author Wallis, R.
dc.contributor.author Kamboj, Varun S.
dc.contributor.author Xiao, L.
dc.contributor.author Ren, Y.
dc.contributor.author Braeuninger-Weimer, P.
dc.contributor.author Aria, Adrianus Indrat
dc.contributor.author Hofmann, S.
dc.contributor.author Beere, H. E.
dc.contributor.author Ritchie, D. A.
dc.contributor.author Degl’Innocenti, R.
dc.date.accessioned 2017-09-05T10:44:17Z
dc.date.available 2017-09-05T10:44:17Z
dc.date.issued 2017-08-09
dc.identifier.citation S. J. Kindness, D. S. Jessop, B. Wei et al. External amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devices. Scientific Reports, Volume 7, Article number: 7657 (2017) en_UK
dc.identifier.issn 2045-2322
dc.identifier.uri http://dx.doi.org/10.1038/s41598-017-07943-w
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/12439
dc.description.abstract Active 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.language.iso en en_UK
dc.publisher Nature Publishing Group en_UK
dc.rights Attribution 4.0 International
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.title External amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devices en_UK
dc.type Article en_UK


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