Study and fabrication of microoptics integrated to an infrared focal-plane array

In recent years, the infrared imaging market has trended towards pixel size reduction. Interpixel crosstalk is a major limitation of small pitch devices, as it reduces the image resolution via the degradation of the modulation transfer function. The aim of this thesis is to study and fabricate pixel-level microoptics capable of reducing the crosstalk. The thesis will revolve around two main axes. Refractive microlenses will be studied both experimentally and by simulation to figure out their limitations when the pixel size approaches the detected wavelength, i.e. when diffraction effects Inside the pixel can no longer be neglected. Later on, other approaches such as metasurfaces or dedicated refractive designs will be intriduced to improve the performance. The thesis will provide a clearer picture of current limitations of pixel level micro optics for infrare Imaging at small pixel pitch.

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