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The miniaturization of pixel is essential for achieving high-resolution,planar, compact-size focal plane arrays (FPAs); however, the resulted increasein the optical crosstalk between adjacent pixels leads to serious drawback andtrade-off. In the current work, we design and propose an efficient broadbandpolarization-insensitive all-dielectric metasurface lens array-based focalplane arrays (FPA) operating in the mid-wave infrared (MWIR). High focusingefficiency over 0.85 with superior optical crosstalk performance is achieved.We demonstrated that optical crosstalk can be reduced to low levels below 2.8%with high efficiency. For the device performance, a similar figure-of-merit(FoM) from the previous reports was used and our device achieved FoM of 91which outperformed all other types MWIR FPAs designed so far. Proposedmetasurface lens arrays demonstrate great potential for increasing the signalto noise ratio and sensitivity thus paving the way for compact-size,high-resolution FPAs.

Broadband polarization-independent low-crosstalk metasurface lens array-based mid wave infrared focal plane arrays