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A novel polymer refractive microlens array has been formed on the surface of 256(V)×290(H) PtSi Schottky-barrier infrared charge coupled device (IRCCD) image sensors to improve the photoresponsivity of the IRCCD. The fabrication process flows of polymer microlens array are described. An effective aperture ratio in excess of 92% of microlens array has been achieved. An experimental facility to evaluate the optical performance of microlens array is introduced. The measurement results show that the microlens array indicates better than 4% non-uniformity of focal length and high optical performance. The application of the microlens array to improve the photosensitivity of infrared CCD is discussed.
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Ke et al. (2004) studied this question.
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