  The miniaturization of pixel is essential for achieving high-resolution,
planar, compact-size focal plane arrays (FPAs); however, the resulted increase
in the optical crosstalk between adjacent pixels leads to serious drawback and
trade-off. In the current work, we design and propose an efficient broadband
polarization-insensitive all-dielectric metasurface lens array-based focal
plane arrays (FPA) operating in the mid-wave infrared (MWIR). High focusing
efficiency 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 91
which outperformed all other types MWIR FPAs designed so far. Proposed
metasurface lens arrays demonstrate great potential for increasing the signal
to noise ratio and sensitivity thus paving the way for compact-size,
high-resolution FPAs.

Optics