Multi-band integrated Quantum Well Infrared Photodetectors

A multi-band integrated quantum well infrared photodetector chip has been demonstrated with the peak wavelengths in seven bands modulated from 13.0 to 15.2 μm. The wavelength modulation is realized by changing the top metal patch width of the metal-insulator-metal plasmonic microcavity coupling structures, due to the dependence of the resonant peak wavelength upon the patch width. This might provide a new way for multispectral imaging focal plane arrays.