期刊
ADVANCED SCIENCE
卷 9, 期 27, 页码 -出版社
WILEY
DOI: 10.1002/advs.202201227
关键词
gap-plasmon metasurface; high-resolution multiple-species atmospheric profiler; plasmon hybridization; spatial-spectral-polarimetric images
资金
- NASA Earth Science Technology Office directed Research and Technology Development (R&TD) Propulsion Laboratory Strategic Initiative RTD program
- NASA Atmospheric Composition: Aura Science Team and Atmospheric Composition Modeling and Analysis Program [NNN13D455T]
- Ministry of Science and Technology of Taiwan [MOST 110-2112-M-003-020-MY3]
- National Aeronautics and Space Administration [80NM0018D0004]
This study develops a broadband, high efficiency polarized beam splitter metagrating based on integrated resonant units, which enables simultaneous polarization analysis, spectral dispersion, and spatial imaging. It is a key technology component for the high-resolution multiple-species atmospheric profiler and can measure aerosol profiling in Earth's planetary boundary layer.
A broadband, high efficiency polarized beam splitter (PBS) metagrating based on integrated resonant units (IRUs) to enable simultaneous polarization analysis, spectral dispersion, and spatial imaging in the near infrared (NIR) is developed. A PBS metagrating with a diameter of 60 mm is the key technology component of the high-resolution multiple-species atmospheric profiler in the NIR (HiMAP-NIR), which is a spaceborne instrument concept crafted to be a core payload of NASA's new generation Earth System Observatory. HiMAP-NIR will enable the aerosol profiling in Earth's planetary boundary layer (from surface to2 km altitude) by simultaneously measuring four spatial-spectral-polarimetric images from 680 to 780 nm. Through detailed optimization of hybridized resonant modes in IRUs, the PBS metagrating shows a diffraction efficiency of 70% (or better) for all four linear-polarized incident light, and polarization contrasts between orthogonal states are 0.996 (or better) from 680 to 780 nm. It meets the stringent performance required by the HiMAP-NIR exploiting a new paradigm for the broad applications of metasurfaces.
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