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Novel high-speed graded superlattice InAlGaAs photovoltaic detector

We describe both the high-speed response and the steady-state behavior of a novel high-speed graded superlattice photovoltaic detector. The 3-dB bandwidth of the detector is larger than 10 GHz. Its ultimate speed is on the order of picoseconds. The intrinsic speed does not depend on the device size. The differences between two different superlattice structures are compared.