High-speed operation of GaN/AlGaN quantum cascade detectors at λ≈1.55 μm

A. Vardi, N. Kheirodin, L. Nevou, H. MacHhadani, L. Vivien, P. Crozat, M. Tchernycheva, R. Colombelli, F. H. Julien, F. Guillot, C. Bougerol, E. Monroy, S. Schacham, G. Bahir

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60 Scopus citations


We demonstrate room-temperature, high-speed operation of GaN/AlGaN quantum cascade detectors. The devices are processed as square mesas with 50 Ω coplanar access lines. Frequency response measurements were performed under illumination by a modulated laser diode emitting at λ=1.55 μm. The electrical response exhibits a first-order filter frequency response. For 17×17 μ m2 (25×25 μ m2) detectors the -3 dB cutoff frequency is 11.4 GHz (6.5 GHz). S-parameter analysis confirms that the cutoff frequency is extrinsically limited and that the speed of the device can be further increased by reducing the device size.

Original languageEnglish
Article number193509
JournalApplied Physics Letters
Issue number19
StatePublished - 2008


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