For many quantum-photonic applications highly efficient and fast single-photon detectors are of utmost importance. Resonant tunneling diode (RTD) photodetectors can be operated as low-noise and high-speed amplifiers of small optically generated electrical signals. For this purpose, RTD photodetectors exploit that the tunneling current is extremely sensitive to changes in the local electrostatic potential, which enables the detection of single photogenerated minority charge carriers, and hence the detection of single photons with the capability of photon-number resolution. Here, we present different RTD device geometries and operation schemes for enhanced quantum-efficiency and operation frequencies.
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