Broadband Unidirectional Visible Imaging Using Wafer-Scale Nano-Fabrication of Multi-Layer Diffractive Optical Processors
We present a broadband and polarization-insensitive unidirectional imager that operates at the visible part of the spectrum, where image formation occurs in one direction while in the opposite direction, it is blocked. This approach is enabled by deep learning-driven diffractive optical design with...
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Zusammenfassung: | We present a broadband and polarization-insensitive unidirectional imager
that operates at the visible part of the spectrum, where image formation occurs
in one direction while in the opposite direction, it is blocked. This approach
is enabled by deep learning-driven diffractive optical design with wafer-scale
nano-fabrication using high-purity fused silica to ensure optical transparency
and thermal stability. Our design achieves unidirectional imaging across three
visible wavelengths (covering red, green and blue parts of the spectrum), and
we experimentally validated this broadband unidirectional imager by creating
high-fidelity images in the forward direction and generating weak, distorted
output patterns in the backward direction, in alignment with our numerical
simulations. This work demonstrates the wafer-scale production of diffractive
optical processors, featuring 16 levels of nanoscale phase features distributed
across two axially aligned diffractive layers for visible unidirectional
imaging. This approach facilitates mass-scale production of ~0.5 billion
nanoscale phase features per wafer, supporting high-throughput manufacturing of
hundreds to thousands of multi-layer diffractive processors suitable for large
apertures and parallel processing of multiple tasks. Our design can seamlessly
integrate into conventional optical systems, broadening its applicability in
fields such as security, defense, and telecommunication. Beyond broadband
unidirectional imaging in the visible spectrum, this study establishes a
pathway for artificial-intelligence-enabled diffractive optics with versatile
applications, signaling a new era in optical device functionality with
industrial-level massively scalable fabrication. |
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DOI: | 10.48550/arxiv.2412.11374 |