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Quantum-cascade lasers (QCL) enable emission in a broad range of infrared radiation unavailable for convectional quantum well bipolar lasers. However in-plane geometry of QCLs hinders achieving properties required in numerous applications which are inherently possessed by vertical-cavity surface-emitting lasers (VCSELs). In proposed design of QC-VCSEL the role of top mirror and element inducing component of electric field necessary to stimulated emission in quantum cascades is served by subwavelength monolithic high-refractive-index contrast grating (MHCG) in which quantum cascade active region is embedded. This paper based on numerical analysis presents influence of QC-VCSELs configuration details on threshold currents and mode distributions.
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Mikolaj Janczak, Robert P. Sarzała, Włodzimierz Nakwaski, Tomasz G. Czyszanowski, "Configuration optimisation of quantum-cascade vertical-cavity surface-emitting lasers," Proc. SPIE PC12021, Novel In-Plane Semiconductor Lasers XXI, PC120210J (9 March 2022); https://doi.org/10.1117/12.2608855