High-speed quantum cascade detector characterized with a mid-infrared femtosecond oscillator.
Opt Express
; 29(4): 5774-5781, 2021 Feb 15.
Article
em En
| MEDLINE
| ID: mdl-33726109
ABSTRACT
Quantum cascade detectors (QCD) are photovoltaic mid-infrared detectors based on intersubband transitions. Owing to the sub-picosecond carrier transport between subbands and the absence of a bias voltage, QCDs are ideally suited for high-speed and room temperature operation. Here, we demonstrate the design, fabrication, and characterization of 4.3â
µm wavelength QCDs optimized for large electrical bandwidth. The detector signal is extracted via a tapered coplanar waveguide (CPW), which was impedance-matched to 50â
Ω. Using femtosecond pulses generated by a mid-infrared optical parametric oscillator (OPO), we show that the impulse response of the fully packaged QCDs has a full-width at half-maximum of only 13.4â
ps corresponding to a 3-dB bandwidth of more than 20â
GHz. Considerable detection capability beyond the 3-dB bandwidth is reported up to at least 50â
GHz, which allows us to measure more than 600 harmonics of the OPO repetition frequency reaching 38â
dB signal-to-noise ratio without the need of electronic amplification.
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2021
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Article