Faculté des sciences

Quantum-cascade-laser structures as photodetectors

Hofstetter, Daniel ; Beck, Mattias ; Faist, Jérôme

In: Applied Physics Letters, 2002, vol. 81, p. 2683-2685

We evaluated two different quantum-cascade-laser structures as photodetectors. The first device was a 5.3 µm two-phonon-resonance structure, and the second one a 9.3 µm bound-to-continuum transition laser. The 5.3 µm structure had a peak responsivity of 120 µA/W at 2200 cm–1 and functioned up to 325 K. On the other hand, the 9.3 µm device also... Plus

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    Summary
    We evaluated two different quantum-cascade-laser structures as photodetectors. The first device was a 5.3 µm two-phonon-resonance structure, and the second one a 9.3 µm bound-to-continuum transition laser. The 5.3 µm structure had a peak responsivity of 120 µA/W at 2200 cm–1 and functioned up to 325 K. On the other hand, the 9.3 µm device also worked up to 297 K but had a lower responsivity of 50 µA/W at 1330 cm–1. Since the absorption peak of these devices can be shifted by applying an external bias, we envision interesting applications in free-space optical telecommunications.