Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers

Guozhen Liang, Emmanuel Dupont, Saeed Fathololoumi, Zbigniew R. Wasilewski, Dayan Ban, Hou Kun Liang, Ying Zhang, Siu Fung Yu, Lianhe H. Li, Alexander Giles Davies, Edmund H. Linfield, Hui Chun Liu, Qi Jie Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


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.
Original languageEnglish
Article number7083
JournalScientific Reports
Publication statusPublished - 18 Nov 2014

ASJC Scopus subject areas

  • General


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