Diffraction grating is indispensable for quantum well infrared photodetectors(QWIP) in order to improve optical coupling because of the limitation of quantum selection rules. A numerical approach based on finite difference time domain(FDTD) method was presented for investigating the diffraction effect of a metal grating fabricated in QWIP. Simulation results demonstrate that such a complicated structure can be optimized by electromagnetic analysis based on the FDTD method. Detailed field distribution inside QWIP can be obtained for estimating the optical coupling efficiency of the grating.
Abstract. FINITE DIFFERENCE TIME DOMAIN MODELING OF GRATING-COUPLED QUANTUM WELL INFRARED PHOTODETECTOR[J]. Journal of Infrared and Millimeter Waves,2004,23(6):401~404Copy