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We present superconducting waveguides for terahertz (THz) quantum cascade lasers (QCLs). Double-metal waveguides provide high confinement of the optical mode and low waveguide losses which are dominated by absorption of the radiation in the metal layers. Implementing novel waveguide materials like superconductors is one way to reduce these losses. In order to prove the compatibility with the THz QCL...
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