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Title: Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers
Authors: Liang, G
Dupont, E
Fathololoumi, S
Wasilewski, ZR
Ban, D
Liang, HK
Zhang, Y
Yu, SF 
Li, LH
Davies, AG
Linfield, EH
Liu, HC
Wang, QJ
Issue Date: 2014
Source: Scientific reports, 18 2014, v. 4, no. , p. 1-7
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.
Publisher: Nature Publishing Group
Journal: Scientific reports 
EISSN: 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 http://
The following publication Liang, G., Dupont, E., Fathololoumi, S. et al. Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers. Sci Rep 4, 7083 (2015) is available at
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