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The gate‐tunable wide‐band absorption of graphene makes it suitable for light modulation from terahertz to visible light. The realization of graphene‐based modulators, however, faces challenges connected with graphene's low absorption and the high electric fields necessary to change graphene's optical conductivity. Here, a solid‐state supercapacitor effect with the high‐k dielectric hafnium oxide...
The gain-induced mode pulling in terahertz quantum cascade lasers is measured and then modified using an aperiodic photonic lattice, providing a complex multi-band filter response, integrated within the Fabry-Pérot cavity.
Two independently electrically driven terahertz quantum cascade lasers are optically coupled in a Y-configuration. Total peak output powers and emission spectra of this Y-system differ from those of either arm and from their linear sum.
We present a perturbative aperiodic distributed feedback grating embedded within a Fabry-Pérot cavity. Time domain modelling revealed electronic switching functionality, occurring only in the presence of facet reflections. The switching behaviour was experimentally verified.
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