A metal grating coupled bound-to-miniband transition GaAs multiquantum well/superlattice infrared detector

We report here a new metal grating coupled top illumination, bound-to-miniband transition multiple quantum well/superlattice GaAs/AlGaAs long wavelength infrared detector. By using resonant tunneling and coherent transport along the superlattice miniband, at the same time increasing the effective barrier height of the quantum well and reducing the noise-like charge transport higher energy bandwidth, a peak detectivity D* of 1.6×1010 cm√Hz/W at 8.9 μm and T= 77 K was obtained for this detector.