High-speed quantum cascade detector characterized with a mid-infrared femtosecond oscillator
| Autor: | Hillbrand, Johannes, Krüger, Léonard M., Dal Cin, Sandro, Knötig, Hedwig, Heidrich, Jonas, Andrews, Aaron M., Strasser, Gottfried, Keller, Ursula, Schwarz, Benedikt |
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| Jazyk: | angličtina |
| Předmět: | |
| ISSN: | 1094-4087 |
| Popis: | 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 4.3 µm wavelength QCDs optimized for large electrical bandwidth. The detector signal is extracted via a tapered coplanar waveguide (CPW), which was impedance-matched to 50 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 13.4 ps corresponding to a 3-dB bandwidth of more than 20 GHz. Considerable detection capability beyond the 3-dB bandwidth is reported up to at least 50 GHz, which allows us to measure more than 600 harmonics of the OPO repetition frequency reaching 38 dB signal-to-noise ratio without the need of electronic amplification. Optics Express, 29 (4) ISSN:1094-4087 |
| Databáze: | OpenAIRE |
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