We present in this paper a direct comparison of the optical properties of InP- and GaAs-based quantum cascade laser waveguides operating in the midinfrared wavelength range. The absorption loss and optical confinement were calculated using a two-dimensional electromagnetic finite-element method. The effect on the waveguide properties of SiO2, Si3 N 4, As2 S3, and Ge0.25 Se 0.75 used as electrical insulation layers is investigated. The results indicate that a careful choice of this particular layer according to the geometrical structure and the emission wavelength should enhance the laser performance.
|Journal||Journal of Applied Physics|
|Publication status||Published - 1 Sep 2009|