Z. Tian, Z. Cai, R. Q. Yang, T. D. Mishima, M. B. Santos, M. B. Johnson, and J. F. Klem, “Interband Cascade Infrared Photodetectors”, Quantum Sensing and Nanophotonic Devices VII, Photonics West, San Francisco, CA, January 23-28, 2010, CA, USA (in Proc. SPIE 7608, paper 76081X).