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Proceedings Paper

Development of HgCdTe single-element APDs based detectors for low flux short wave infrared applications
Author(s): K. Foubert; G. Lasfargues; L. Mathieu; S. Benahmed; G. Vojetta; J. Rothman; Q. Benoît à la Guillaume; Vincent Calvo; Jérémy Picot-Clemente; Florent Le Mounier; Fabien Gibert
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Paper Abstract

The remarkable properties (internal gain larger than 100 and close to unity excess noise factor) of Short Wave Infrared (SWIR) HgCdTe electron-initiated Avalanche Photodiodes (e-APDs) are put to good use to demanding applications, i.e. spectroscopy and LIDAR. Knowing the requirements of both situations, we have designed specific models based on highly sensitive single elements APDs and adapted proximity electronics. On one hand, we use the e-APDs low noise equivalent power (NEP) at 180K (few fW/Hz1/2). We simultaneously designed a specific Transimpedance Amplifier (TIA) which allows us to take advantage of the low APD NEP. The combination of both elements along with a dedicated cryostat enables direct LIDAR detection at moderate bandwidth (BW = 20 MHz) without the need for long time averaging, which is crucial in far field (≥ 5 km) analysis. One the other hand, we have optimized a low-noise and low-frequency LN2 cooled prototype operating with an external commercial amplifier. It allows us to observe the photoluminescence of Ge nanostructures in the range 1.5-2.5 μm with a significantly increased SNR along with a reduce pump laser power. The possibility to use these detectors in the photon counting limit will be discussed in light of our recent results. In parallel, we present preliminary time response measurements performed on SWIR APD suggesting that a higher GHz BW could be reached with this type of detector. This is however subjected to optical optimization at the moment.

Paper Details

Date Published: 11 March 2013
PDF: 22 pages
Proc. SPIE 8621, Optical Components and Materials X, 86210F (11 March 2013); doi: 10.1117/12.2004109
Show Author Affiliations
K. Foubert, CEA-LETI-Minatec (France)
G. Lasfargues, CEA-LETI-Minatec (France)
L. Mathieu, CEA-LETI-Minatec (France)
S. Benahmed, CEA-LETI-Minatec (France)
G. Vojetta, CEA-LETI-Minatec (France)
J. Rothman, CEA-LETI-Minatec (France)
Q. Benoît à la Guillaume, CEA, INAC/SP2M/SINAPS (France)
Vincent Calvo, CEA, INAC/SP2M/SINAPS (France)
Jérémy Picot-Clemente, Lab. de Météorologie Dynamique, CNRS, Ecole Polytechnic (France)
Florent Le Mounier, Lab. de Météorologie Dynamique, CNRS, Ecole Polytechnic (France)
Fabien Gibert, Lab. de Météorologie Dynamique, CNRS, Ecole Polytechnic (France)

Published in SPIE Proceedings Vol. 8621:
Optical Components and Materials X
Michel J. F. Digonnet; Shibin Jiang; J. Christopher Dries, Editor(s)

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