Very long wavelength infrared focal plane arrays with 50% cutoff wavelength based on type-II InAs/GaSb superlattice

Han Xi^{1, 2}, Xiang Wei^{1, 2}, Hao Hong-Yue^{1, 2}, Jiang Dong-Wei^{1, 2}, Sun Yao-Yao^{1, 2}, Wang Guo-Wei^{1, 2}, Xu Ying-Qiang^{1, 2}, Niu Zhi-Chuan^{1, 2, †}

(color online) (a) Schematic of the N-M-π-P detector hetero-structure. (b) AFM image of a typical m² area. (c) High-resolution x-ray diffraction spectrum and characterization according to different super-lattices.