Patent ID: 9207120
Filing Date: 2015-12-08
Classification: G01J,H01L

Abstract:
1. A dual-band infrared detector comprising: a first absorption layer, wherein said first absorption layer is sensitive to only a first infrared wavelength band; a barrier layer coupled to said first absorption layer, said barrier layer includes a first section that is coupled to the first absorption layer and includes a first amount of Gallium, a second section that is opposite said first absorption layer and includes a second amount of Gallium that is different from the first amount of Gallium, and a gradient between the first amount of Gallium in said first section and the second amount of Gallium in said second section; and a second absorption layer coupled to said second section of said barrier layer, wherein said second absorption layer is sensitive to only a second infrared wavelength band that is different from the first infrared wavelength band, wherein said infrared detector is capable of detecting the first wavelength band and the second wavelength band by applying a first bias voltage of a first polarity to said first absorption layer and by applying a second bias voltage of a second polarity that is opposite the first polarity to said second absorption layer, wherein the first bias voltage and the second bias voltage each have a magnitude of less than about or equal to 500 mV.