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The mid-IR band recently attracted great interest for future wireless communication due to its low attenuation and high tolerance against atmospheric perturbations. Recent advances in monolithic integration of same-wavelength quantum cascade lasers (QCLs) and detectors (QCDs) paved the way for a new generation of functional photonic integrated circuits. In this context, integrating novel mid-IR plasmonic waveguides has been highly suitable for realizing efficient chip-scale optical links between different active components. Here we report on developing a mid-IR on-chip heterodyne receiver. This includes the first demonstration of plasmonic waveguides for on-chip beam-guiding in the long-wave infrared and novel high-performance QCLs and QCDs.
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Mauro David, Georg Marschick, Elena Arigliani, Nikola Opacak, Dominik Koukola, Benedikt Schwarz, Gottfried Strasser, Borislav Hinkov, "Merging mid-IR QC technology with plasmonic interconnects: a monolithically integrated mid-infrared heterodyne receiver," Proc. SPIE PC12424, Integrated Optics: Devices, Materials, and Technologies XXVII, PC124240R (17 March 2023); https://doi.org/10.1117/12.2650062