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We present terahertz quantum cascade lasers operating at a defect mode of aphotonic crystal bandgap. This class of devices exhibits single mode emissionand low threshold current compared to standard metal-metal lasers. The modeselectivity is an intrinsic property of the chosen fabrication design. Thelower lasing threshold effect, already reported in photonic crystal quantumcascade lasers, is further enhanced in the ultra-flat-dispersion defect line.The presented results pave the way for integrated circuitry operating in theterahertz regime and have important applications in the field of quantumcascade lasers, spectroscopy and microcavity lasers.

Defect Line Terahertz Quantum Cascade Laser