Abstract
We demonstrate two GaAs/AlGaAs-based terahertz (THz) quantum well photo-detectors (QWPs), with one-dimensional (1D) metal grating and 45° facet light coupling configurations. The two THz QWPs have the same multi-quantum well structure parameters. The different light coupling configurations do not affect the peak response frequency (5.85 THz). The background limited infrared performance temperatures and responsivities of the two devices are measured. The effects of different light coupling configurations on the main features of the devices are investigated in detail. The experimental results show that the performance of the THz QWP with 1D metal grating is a little better but there is still a lot of room for improvement.
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