A hybrid plasmonic waveguide terahertz quantum cascade laser

Degl'Innocenti, R., Shah, Y. D. , Wallis, R., Klimont, A., Ren, Y., Jessop, D. S., Beere, H. E. and Ritchie, D. A. (2015) A hybrid plasmonic waveguide terahertz quantum cascade laser. Applied Physics Letters, 106(8), 082101. (doi:10.1063/1.4913307)

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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.

Item Type:Articles
Additional Information:The authors acknowledge the financial support from the Engineering and Physical Sciences Research Council (Grant No. EP/J017671/1, Coherent Terahertz Systems).
Glasgow Author(s) Enlighten ID:Shah, Dr Yash Diptesh
Authors: Degl'Innocenti, R., Shah, Y. D., Wallis, R., Klimont, A., Ren, Y., Jessop, D. S., Beere, H. E., and Ritchie, D. A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:American Institute of Physics
ISSN (Online):1077-3118
Published Online:23 February 2015

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