Crosstalk suppressing design of GaAs microlenses integrated on HgCdTe infrared focal plane arrays

Crosstalk suppressing design of dielectric GaAs microlenses integrated on traditional HgCdTe infrared focal plane arrays (IRFPAs) is presented in this paper, by exploiting the finite difference time domain (FDTD) technique. Responsive photocurrent and crosstalk between most adjacent IR detector pixels have been numerically simulated using Crosslight TCAD commercial software. An optimal curvature of GaAs microlenses has been achieved by maximizing its ability to focus the incoming infrared plane wave at a specific point near the interface of GaAs substrate and HgCdTe absorber layer.