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Abstract-We present the simulation results of a method for the quantum cascade detectors (QCD) optical coupling. A metal grating was integrated with a QCD to convert normal-incident electromagnetic (EM) waves into non-normal, higher-order propagating wave (HOPW) and surface plasmon wave (SPW), which contribute to excite the bound-to-bound (BTB) intersubband transition of carriers in the QCD. The presented results have significance for the QCD optical coupling design and optimization.

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We present the results of a model for the detectivity simulation of multi-period AlGaAs/GaAs Long-wavelength quantum well infrared photodetectors (LW-QWIPs) by assuming a three-dimensional carrier transport in the barriers where the electrical fields are obtained in a self-consistent way. This model takes into account the fundamental mechanisms involved in the device detection process. The electrical field distribution, currents and detectivities are carefully calculated and analyzed. The numerical results explain well our experimental observations.

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