Terahertz emission from localized modes in one-dimensional disordered systems [Invited]

We demonstrate terahertz (THz) frequency laser emission around 3.2 THz from localized modes in one-dimensional disordered grating systems.The disordered structures are patterned on top of the double-metal waveguide of a THz quantum cascade laser.Multiple emission peaks are observed within a frequency range corresponding to the bandgap of a periodic counterpart with no disorder, indicating the presence of mode localization aided by Bragg scattering.Simulations and experimental measurements provide strong evidence for the spatial localization of the THz laser modes.