Vers l'intégration de fonctions d'imagerie sur le plan focal infrarouge. Application à la conception et à la réalisation d'une caméra sur puce infrarouge cryogénique.

Florence de la Barriere 1
1 Laboratoire Charles Fabry / Scop
LCF - Laboratoire Charles Fabry
Abstract : Miniaturizing optical systems is a research area of great interest nowadays : if they were smaller and cheaper, optical systems could be widespread in many applications. This work aims at designing very compact optical systems for imagery applications, which could be integrated near the infrared cryogenic detector and ideally directly on it. First, I have presented original design strategies to simplify and miniaturize optical systems. Approaches which lead to multichannel systems seem to be the most interesting ones to design compact and effective systems. Then, I have proposed two multichannel optical architectures, which are simple, compact, and integrated near the infrared detector. The first camera, which has a field of view equal to 120°, integrates a microlens array at a few hundreds of micrometers only of the infrared detector : it is called a wafer-level camera. Technological challenges have been overcome to manufacture this component. I have developed an image processing method, and assessed the characteristics of the camera experimentally. This system samples the final image with a pitch equal to 7,5 µm. This value is two times better than the one which could be obtained by using a one-channel camera associated with a state-of-the-art infrared detector, with a pixel pitch equal to 15 µm. In order to manufacture the second architecture, I have developed an original and simple method to obtain the microlens arrays, by compression molding of Potassium Bromide powder at ambient temperature. This work gives some elements to design a new generation of infrared detectors with an imagery function.
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Florence de la Barriere. Vers l'intégration de fonctions d'imagerie sur le plan focal infrarouge. Application à la conception et à la réalisation d'une caméra sur puce infrarouge cryogénique.. Optique [physics.optics]. Université Paris Sud - Paris XI, 2012. Français. ⟨pastel-00829219⟩

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