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We demonstrate single-mode, surface-emitting terahertz lasers at lambdaap110 mum employing photonic-crystal resonators. The devices employ metal-metal waveguides, and the photonic-crystal lattice is implemented by the sole patterning of the top metal contact, without deep-etching the semiconductor in the photonic crystal holes. The device emission wavelength correctly tunes with the photonic crystal...
We demonstrate full control of the spectral and spatial emission properties of terahertz quantum cascade lasers using metallic photonic-crystals for lateral confinement. Single-mode, surface-emission is obtained at a frequency of 2.8-2.9 THz using a photonic-crystal design with a square lattice geometry. The resonator quality factor is then optimised, using a graded photonic-crystal architecture,...
Recent results are presented on the non-linear intra-cavity up-conversion in the telecom range and the microwave modulation of THz quantum cascade lasers.
THz quantum cascade (QC) lasers with an active-region thickness of 5.86 mum was demonstrated. The current threshold was then reduced by reducing the device surface. The laser resonator is based on a micro-cylindrical geometry. In general micro-cylindrical resonators rely on total-internal reflection on the cavity sidewalls in order to confine the light. The small (r=25 mum) and medium (r=37.5 mum)...
Intra-cavity THz-sideband generation over the entire telecom range is demonstrated by injecting a near-infrared beam into a quantum cascade laser (f=2.8 THz). This process is phase- matched due to the phonon-induced anomalous dispersion typical of semiconductor compounds.
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