We reduce thickness of the active cores in THz/mid-infrared quantum-cascade lasers. Devices with active regions 60 times thinner than free-space emission wavelength are demonstrated with surprisingly modest increase in threshold current density.
© 2011 OSA
E. Strupiechonski, D. Grassani, D. Fowler, F. H. Julien, R. Colombelli, S. P. Khanna, L. Li, E. H. Linfield, G. A. Davies, and A. B. Krysa, "Vertical Sub-Wavelength Mode Confinement in THz Quantum Cascade Lasers," in CLEO:2011 - Laser Applications to Photonic Applications, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CThE6.
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