Quantum cascade detectors (QCD) are photovoltaic mid-infrared detectors based on intersubband transitions. The sub-picosecond carrier transport between subbands and the absence of a bias voltage make QCDs ideally suited for high-speed and room temperature operation. Interband cascade detectors (ICDs) combine interband optical transitions with fast intraband transport to achieve high-frequency and broad-wavelength operation at room temperature.
We report the design, fabrication, and characterization of QCDs optimized for large electrical bandwidth. Femtosecond pulses generated by a mid-infrared optical parametric oscillator are used to demonstrate QCDs with a 3-dB bandwidth of more than 20 GHz and measure the saturation characteristics of ICDs.
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