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Conferences > CLEO_SI > 2011 > CThE > CThE6

Vertical Sub-Wavelength Mode Confinement in THz Quantum Cascade Lasers

E. Strupiechonski, D. Grassani, D. Fowler, F. H. Julien, R. Colombelli, S. P. Khanna, L. Li, E. H. Linfield, A. G. Davies, and A. B. Krysa

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Abstract

We exploit the modal confinement properties of metal-metal ridge waveguides to reduce the thickness of the active laser cores in both terahertz and mid-infrared quantum cascade lasers. Devices with active regions over 60 times thinner than the free-space emission wavelength are demonstrated. The devices surprisingly show only a modest increase in threshold current density compared with conventional-thickness devices.

© 2011 Optical Society of America

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