An Ultra‐Broadband High Efficiency Polarization Beam Splitter for High Spectral Resolution Polarimetric Imaging in the Near Infrared

Hsiao, Hui Hsin; Muller, Richard E.; McGuire, James P.; Nemchick, Deacon J.; Shen, Chin-Hung; Harten, Gerard van; Rud, Mayer; Johnson, William R.; Nordman, Austin; Wu, Yen-Hung; Wilson, Daniel W.; Chiou, Yih-Peng; Choi, Myungje; Hyon, Jason J.; Fu, Dejian

doi:10.1002/advs.202201227

Cited by 7 publications

(1 citation statement)

References 54 publications

(49 reference statements)

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“…Metasurfaces − are composite structures formed by arranging numerous artificially engineered subwavelength unit elements in two-dimensional (2D) space, which have attracted extensive attention and research in various fields such as microwave, , millimeter wave, terahertz, ,− optics, − and acoustics , due to their abilities to manipulate spatial incident waves flexibly. Accordingly, special electromagnetic (EM) phenomena such as perfect refraction , and negative refraction have been observed based on the metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

Li,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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The electromagnetic (EM) beam manipulations such as spatial scanning have always been the focus in information science and technology. Generally, the transmitting and receiving (T/R) beams of the same aperture should be coincident due to the reciprocal theory, and hence, more flexible controls of the spatial information are limited accordingly. Here, we propose a new approach to achieve independent controls of beam scanning in spatial T/R channels based on one aperture made by a nonreciprocal programmable metasurface. The meta-atom is designed to have independent propagation chains for T/R waves by introducing dual-direction power amplifiers (PAs) as the isolators for one-way transparency. A programmable phase shifter with a 360°coverage is loaded with the PA device in the transmitting or receiving chain to realize independent beam scanning in the T/R channels. A prototype of the proposed metasurface is fabricated, and independent beam scanning in the T/R channels is directly acquired with good performance in our measurements. In addition, a proof of concept of integrated sensing and auxiliary communications is accomplished to verify the validity of the presented method.

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Section: Introductionmentioning

confidence: 99%

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

Li,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Deep Learning Design for Multiwavelength Infrared Image Sensors Based on Dielectric Freeform Metasurface

Xiong,

Xu,

et al. 2023

Advanced Optical Materials

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Near‐infrared multispectral imaging technology enhances target detection and recognition by distinguishing the spectral characteristics of various targets. However, traditional imaging systems heavily rely on complex optical filter designs that are often bulky and mechanically unstable, posing significant challenges for miniaturization and integration challenging. In this study, a freeform dielectric metasurface with the wavelength‐multiplexing focusing effect based on a deep learning model is designed, which can separate the mixed near‐infrared light into distinct wavelengths. To effectively modulate the complex amplitude of the transmitted light at three distinct near‐infrared wavelengths (1150, 1350, and 1550 nm), high‐index silicon freeform nanostructures supporting rich resonant modes are proposed. An inverse design model based on deep learning is utilized to generate individual freeform nanostructures pixel by pixel, satisfying the complex amplitude requirement for a multiplexed metalens design. Both the simulated and experimental results show that the wavelength‐multiplexing effect of the devices is in good agreement with the target with negligible crosstalk. Finally, a metasurface is employed to realize near‐infrared multispectral imaging, which allows for the distinct detection and decoding of images at the three target wavelengths. The proposed technology has a wide range of applications in clinical medicine, biological tissue imaging, and deep‐space exploration.

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An Ultra‐Broadband High Efficiency Polarization Beam Splitter for High Spectral Resolution Polarimetric Imaging in the Near Infrared

et al. 2022

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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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An Ultra‐Broadband High Efficiency Polarization Beam Splitter for High Spectral Resolution Polarimetric Imaging in the Near Infrared

Cited by 7 publications

References 54 publications

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

Independent Manipulations of Transmitting and Receiving Channels by Nonreciprocal Programmable Metasurface

Deep Learning Design for Multiwavelength Infrared Image Sensors Based on Dielectric Freeform Metasurface

An Ultra‐Broadband High Efficiency Polarization Beam Splitter for High Spectral Resolution Polarimetric Imaging in the Near Infrared

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