Abstract
We present high-speed, room-temperature operated 4.3 μm quantum cascade detectors. The devices are processed as square mesas with 50 Ω coplanar access line and air-bridge connector. The high frequency features are explored using microwave rectification technique and a RLC circuit model. The -3 dB cutoff frequency is experimentally 9 GHz and 4 GHz for 20×20 μm2 and 50×50 μm2 detectors, respectively. The equivalent circuit analysis shows that a second order filter feature governs the devices. Higher cutoff frequency can be achieved by eliminate the parasitics further.
Highlights
We present high-speed, room-temperature operated 4.3 μm quantum cascade detectors
Compared to ISB photoconductive (PC) quantum-well infrared photodetectors (QWIPs),[3] which have been proposed for high speed applications, quantum cascade detectors (QCDs) have their unique appealing advantages stemmed from their operation principle
QCDs have covered a large wavelength range from the near-infrared to the terahertz region[4,5,6] and some performances have achieved the same order of magnitude as QWIPs.[7,8]
Summary
We present high-speed, room-temperature operated 4.3 μm quantum cascade detectors. The high frequency features are explored using microwave rectification technique and a RLC circuit model.
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