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Quantum Cascade Lasers (QCLs) have become one of the most used light sources in the Mid-IR. It has been demonstrated that QCLs can operate as frequency combs (FCs) [1] and that the performance of QCL FCs can be significantly improved by compensating for their waveguide dispersion using dielectric coating based Gires-Tournois interferometers [2]. However, the latter are incompatible with high optical...
We couple magneto-plasmons ultra-strongly to subwavelength split-ring resonator cavities, probed with THz time domain spectroscopy (TDS). In contrast to cyclotron-polaritons, the ultrastrong coupling regime is reached already at zero magnetic field. Further, the plasmon frequency ωρ is widely tunable using a gate and by changing the sample geometry. This thus allows to observe the transition from...
By introducing side-absorbers to metal-metal waveguides of broadband terahertz quantum cascade lasers, we are able to control and completely suppress higher-order lateral waveguide modes. This change leads to an octave spanning laser spectrum with a 600 GHz wide flat top. In addition, the absence of higher order lateral modes has a strong effect on the pulse generation of injection seeded QCLs. We...
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