Abstract
We discuss the benefits of using microoptics
concentration arrays in connection with image (or
pixellated) photodetectors, in terms of: 1) recovery of
area fill-factor; 2) reduction of equivalent
dark-current; 3) mitigate dead-time issues; and 4)
improved dynamic range. As an example of application, we
describe the fill-factor recovery in connection to an
array of 32$\, \times \,$32 6-$\mu$m diameter, 50-$\mu$m pitch, single photon avalanche detector
(SPAD). We use a 32$\, \times \,$32 array of microlenses, fabricated by polymer
casting in a photoresist replica mold. We demonstrate,
for the first time to the best of our knowledge, an
increase by a factor ${\times}25$ of the effective spectral sensitivity of the
final device. The lens array itself allows a ${\times}35$ recovery, and projected improvements in
excess of ${\times}50$ appear feasible.
© 2011 IEEE
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