Pixel-scale NIR-VIS Spectral Routers Based on 2D Mie-type Metagratings
arxiv(2024)
Abstract
The out-of-band energy loss caused by in-built color filters significantly
degrades the signal-to-noise ratio and the dynamic range of conventional image
sensors, which has restricted the attempt to develop ultrahigh-density imaging
devices by merely shrinking the pixel size. This issue will be more serious for
security cameras which need to collect visible (VIS) light and near-infrared
(NIR) photons as well. The existing solutions mostly explore complex photonic
nanostructures, which are often too complicated for production. In this work,
we demonstrate a pixel-scale spectral router utilizing two-dimensional (2D)
Si3N4 Mie scattering metagratings that can spatially divide NIR (850 nm) and
VIS (400-700 nm) light to different pixels at high efficiencies. It has a
minimum feature size larger than 360 nm, highly promising for massive
production. Compared with the traditional filter design, our router can gain
about 42
show that it also has good polarization insensitivity and incident angle
tolerance. The NIR-VIS simultaneous imaging is inspected without any complex
reconstruction algorithm. Mode analysis indicates that the multipolar
scattering of our Mie-type metagratings provides the necessary degrees of
freedom to spatially optimize the routing functions for broadband photons.
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