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3 October 2011 15 μm pixel-pitch VGA InGaAs module for very low background applications
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Abstract
Thanks to the high transmission coefficient of short infrared wavelengths in the atmosphere and specific contrasts, SWIR imaging is an attractive technology for space applications such as astronomical or earth observation. Detection module must demonstrate high uniformity, sensitivity and resolution combined with compactness to meet the needs of this application field. Image sensors based on InGaAs photodiodes arrays present very low dark currents even at ambient temperature as high quality materials can be grown on InP substrates. Besides, the suppression of InP substrate after hybridization is a way to extend the detection range towards visible wavelengths. These properties result in a new generation of sensitive, compact and multifunctional InGaAs detection modules. In this paper, we describe the performances of an uncooled VGA InGaAs module recently developed. The 640x512 array with a pitch of 15μm allows high resolution images. The excellent crystalline quality induces very low dark current densities at ambient temperature. The readout circuit is based on a capacitive trans-impedance amplifier with correlated double sampling resulting in low readout noise figure. This compact module appears as a serious alternative to the existing technologies for low light level imaging in the [0.4μm-1.7μm] spectral range.
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A. Rouvié, O. Huet, J. L. Reverchon, J. A. Robo, J. P. Truffer, J. Decobert, E. Costard, and P. Bois "15 μm pixel-pitch VGA InGaAs module for very low background applications", Proc. SPIE 8176, Sensors, Systems, and Next-Generation Satellites XV, 81761A (3 October 2011); https://doi.org/10.1117/12.899180
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