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Title: Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers
Authors: Liang, Guozhen
Dupont, Emmanuel
Fathololoumi, Saeed
Wasilewski, Zbigniew R.
Ban, Dayan
Liang, Hou Kun
Zhang, Ying
Yu, Siu Fung
Li, Lianhe H.
Davies, Alexander Giles
Linfield, Edmund H.
Liu, Hui Chun
Wang, Qi Jie
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2014
Source: Liang, G., Dupont, E., Fathololoumi, S., Wasilewski, Z. R., Ban, D., Liang, H. K., et al. (2014). Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers. Scientific reports, 4, 7083-.
Series/Report no.: Scientific reports
Abstract: We report planar integration of tapered terahertz (THz) frequency quantum cascade lasers (QCLs) with metasurface waveguides that are designed to be spoof surface plasmon (SSP) out-couplers by introducing periodically arranged SSP scatterers. The resulting surface-emitting THz beam profile is highly collimated with a divergence as narrow as ~4° × 10°, which indicates a good waveguiding property of the metasurface waveguide. In addition, the low background THz power implies a high coupling efficiency for the THz radiation from the laser cavity to the metasurface structure. Furthermore, since all the structures are in-plane, this scheme provides a promising platform where well-established surface plasmon/metasurface techniques can be employed to engineer the emitted beam of THz QCLs controllably and flexibly. More importantly, an integrated active THz photonic circuit for sensing and communication applications could be constructed by incorporating other optoelectronic devices such as Schottky diode THz mixers, and graphene modulators and photodetectors.
ISSN: 2045-2322
DOI: 10.1038/srep07083
Rights: This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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