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Wavelength-multiplexed orbital angular momentum meta-holography SCIE SCOPUS

Title
Wavelength-multiplexed orbital angular momentum meta-holography
Authors
RHO, JUNSUKJang, JaehyuckMOON, Seong-WonKim, JoohoonMun, JunghoMaier, Stefan ARen, Haoran
Date Issued
2024-09
Publisher
SpringerOpen
Abstract
The field of high-bandwidth holography has been extensively studied over the past decade. Orbital angular momentum (OAM) holography, which utilizes vortex beams with theoretically unbounded OAM modes as information carriers, showcases the large capacitance of hologram storage. However, OAM holography has been limited to a single wavelength, restricting its potential for full-color holography and displays. In this study, we propose wavelength and OAM multiplexed holography that utilizes the multiple dimensions of light-wavelength and OAM-to provide a multi-color platform that expands the information capacity of holographic storage devices. The proposed wavelength-OAM multiplexed holography is physically realized by a metasurface, the state-of-the-art optical element consisting of an array of artificially engineered nanostructures. Hydrogenated silicon meta-atoms, the constituents of the metasurface, are engineered to possess wavelength selectivity by tailoring the dispersion of polarization conversion. These meta-atoms are used to encode the calculated OAM-preserved phase maps based on our design. The sampling grid of the phase map is rotated by 45 degrees, which effectively suppress higher-order diffraction, providing a great strategy for achieving large field-of-view (FOV) holography. We successfully demonstrate six holographic images that are selectively reconstructed under the illumination of light with specific wavelengths (lambda = 450, 635 nm) and topological charges (l = -2, 0, 2), without high-order diffraction. Our work suggests that ultrathin meta-holograms can potentially realize ultrahigh-bandwidth full-color holography and holographic video displays with large FOV.
URI
https://oasis.postech.ac.kr/handle/2014.oak/124536
DOI
10.1186/s43074-024-00142-7
ISSN
2662-1991
Article Type
Article
Citation
PhotoniX, vol. 5, no. 1, 2024-09
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노준석RHO, JUNSUK
Dept of Mechanical Enginrg
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