Title :
Vertical sub-wavelength mode confinement in THz quantum cascade lasers
Author :
Strupiechonski, E. ; Grassani, D. ; Fowler, D. ; Julien, F.H. ; Colombelli, R. ; Khanna, S.P. ; Li, L. ; Linfield, E.H. ; Davies, A.G. ; Krysa, A.B.
Author_Institution :
Inst. d´´Electron. Fondamentale, Univ. Paris-Sud, Orsay, France
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.
Keywords :
quantum cascade lasers; quantum theory; ridge waveguides; semiconductor lasers; terahertz waves; THz quantum cascade lasers; active laser cores; metal-metal ridge waveguides; vertical sub-wavelength mode confinement; Current measurement; Laser modes; Quantum cascade lasers; Temperature measurement; Threshold current; Waveguide lasers;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2011 Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4577-1223-4
