A hybrid plasmonic waveguide terahertz quantum cascade laser

Degl'Innocenti, Riccardo and Shah, Yash D. and Wallis, Robert and Klimont, Adam and Ren, Yuan and Jessop, David S. and Beere, Harvey E. and Ritchie, David A. (2015) A hybrid plasmonic waveguide terahertz quantum cascade laser. Applied Physics Letters, 106 (8). ISSN 0003-6951

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We present the realization of a quantum cascade laser emitting at around 2.85 THz, based on a hybrid plasmonic waveguide with a low refractive index dielectric cladding. This hybrid waveguide design allows the performance of a double-metal waveguide to be retained, while improving the emission far-field. A set of lasers based on the same active region material were fabricated with different metal layer thicknesses. A detailed characterization of the performance of these lasers revealed that there is an optimal trade-off that yields the best far-field emission and the maximum temperature of operation. By exploiting the pure plasmonic mode of these waveguides, the standard operation conditions of a double-metal quantum cascade laser were retrieved, such that the maximum operating temperature of these devices is not affected by the process. These results pave the way to realizing a class of integrated devices working in the terahertz range which could be further exploited to fabricate terahertz on-chip circuitry.

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Journal Article
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Applied Physics Letters
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20 Dec 2017 15:04
Last Modified:
16 Sep 2023 01:36