Abstract
A special method, named step simulation method, is proposed for fabricating Si microlens array to improve the performance of infrared focal plane array (IR FPA). The focus length of rectangle-based multistep microlens array with element dimension of 40 µm×30 µm is 885.4 µm by the method, which is much longer than the focus length of microlens array fabricated by conventional Fresnel binary optics technique., The large-scale 256×256 element microlens array is hybridintegrated with the PtSi Schottky-barrier IR FPA by optical adhesive. The test results show that diffractive spot size of the microlens is 17 µm×15 µm and the average optical response of the IR FPA is increased by a factor of 2.4.
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Chen, S., Yi, X., Li, Y. et al. Hybrid Integration Between Long Focus Microlens Array and IR Detector Array. International Journal of Infrared and Millimeter Waves 22, 393–398 (2001). https://doi.org/10.1023/A:1010737521182
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DOI: https://doi.org/10.1023/A:1010737521182