Midinfrared quantum cascade detector with a spectrally broad response

Abstract

A midinfrared quantum cascade detector with a spectrally broad (ΔE∕E=27.3%) response is designed, fabricated, and tested. This detector consists of 26 differently designed active region stages in order to cover a wavelength region from 4.7to7.4μm. The device could be operated above room temperature and showed peak responsivities of 13mA∕W at 10K and 1.25mA∕W at room temperature. A background limited detectivity of 1.55×1010 Jones was seen up to a temperature TBLIP of 110K.