Terahertz quantum-cascade lasers based upon active reflectarray metasurfaces are shown to be a viable platform for scalable power with high-quality beams. The “metasurface” is made up of sub-wavelength arrays of antenna-coupled sub-cavities loaded with quantum-cascade active material. One has the ability to spatially engineer the amplitude, phase, spectral, and polarization response of the metasurface. We present several recent results. By placing the metasurface as part of external cavity, focusing QC-VECSELs have been demonstrated with high slope efficiency, high cw power, and near diffraction-limited beam quality. Additionally, VECSELs with electrically switchable polarization have been demonstrated.
Benjamin S. Williams, Luyao Xu, Christopher A. Curwen, Daguan Chen, John L. Reno, and Tatsuo Itoh, "Quantum-cascade lasers based upon metasurfaces (Conference Presentation)," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105401L (Presented at SPIE OPTO: January 31, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2293352.5751531078001.
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