AlGaAsSb/InGaAsSb phototransistors for 2-µm remote sensing applications

Tamer F. Refaat; M. Nurul Abedin; Oleg V. Sulima; Syed Ismail; Upendra N. Singh

doi:10.1117/1.1760085

1 July 2004 AlGaAsSb/InGaAsSb phototransistors for 2-μm remote sensing applications

Tamer F. Refaat, M. Nurul Abedin, Oleg V. Sulima, Syed Ismail, Upendra N. Singh

Author Affiliations +

Optical Engineering, Vol. 43, Issue 7, (July 2004). https://doi.org/10.1117/1.1760085

Abstract

Two-micron detectors are critical for atmospheric CO2 profiling using the lidar technique. InGaAs and HgCdTe detectors are commercially available for this wavelength but they lack sufficient gain, which limits their detectivity. The characterization results of a novel AlGaAsSb/InGaAsSb phototransistor for 2-μm application are reported. The device was developed by AstroPower, Inc. for NASA Langley Research Center. Spectral response measurements showed the highest responsivity in a 1.9- to 2.1-μm region with a maximum value of 2650 A/W at 2 μm. A 2-μm detectivity of 3.9×10¹¹ cm Hz^1/2/W was obtained, which corresponds to noise equivalent power of 4.6×10^–14 W/Hz^1/2.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Tamer F. Refaat, M. Nurul Abedin, Oleg V. Sulima, Syed Ismail, and Upendra N. Singh "AlGaAsSb/InGaAsSb phototransistors for 2-μm remote sensing applications," Optical Engineering 43(7), (1 July 2004). https://doi.org/10.1117/1.1760085

Published: 1 July 2004

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