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GaN/AlGaN waveguide quantum cascade photodetectors at λ ≈ 1.55 μm with enhanced responsivity and ∼40 GHz frequency bandwidth

Authors :
Laurent Vivien
Y. Kotsar
Eva Monroy
Asaf Pesach
Patrick Quach
François H. Julien
N. Isac
Djamal Gacemi
S. Sakr
P. Crozat
Maria Tchernycheva
Gad Bahir
Source :
Applied Physics Letters. 102:011135
Publication Year :
2013
Publisher :
AIP Publishing, 2013.

Abstract

We report on ultrafast GaN/AlGaN waveguide quantum cascade detectors with a peak detection wavelength of 1.5 μm. Mesa devices with a size of 7 × 7 and 10 × 10 μm2 have been fabricated with radio-frequency impedance-matched access lines. A strong enhancement of the responsivity is reported by illuminating the waveguide facet, with respect to illumination of the top surface. The room temperature responsivity is estimated to be higher than 9.5 ± 2 and 7.8 ± 2 mA/W, while the −3dB frequency response is extracted to be 42 and 37.4 GHz for 7 × 7 and 10 × 10 μm2 devices, respectively.

Details

ISSN :
10773118 and 00036951
Volume :
102
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........00767677a1d66d499c8d2f1c10b57200