Journal
NANOPHOTONICS
Volume 10, Issue 13, Pages 3519-3525Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0313
Keywords
analog computing; image differentiation; multilayer thin film
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Funding
- Tsinghua University
- National Natural Science Foundation of China [61975251]
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Researchers have proposed an optical filter for isotropic image differentiation, fabricated using mature thin film deposition technique, which can be used for various input polarizations in transmission mode. This thin film filter can conveniently enhance and process images in real time.
It is well-known that a Fourier optical system can be used to perform specific computing tasks, such as image differentiation, with a superior speed and power consumption in comparison with digital computers, despite bulky optical components that are often required. Recently, there has been a surge in the interest to design much more compact nanophotonic structures, such as dielectric and metallic thin films, photonic crystals, and metasurfaces with a tailored angle-dependent (nonlocal) optical response, to directly perform image differentiation without additional lenses for Fourier transformation. Here, we present a straightforward platform, a multilayer dielectric thin film optical filter, fabricated using mature wafer-scale thin film deposition technique, with an optimized nonlocal optical response, for isotropic image differentiation in transmission mode for arbitrary input polarization. The proposed thin film filter may be conveniently coated at various transparent surfaces and inserted in machine vision or microscopy systems for enhanced, real-time image processing.
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