Journal
PHOTONICS RESEARCH
Volume 8, Issue 5, Pages 723-728Publisher
OPTICAL SOC AMER
DOI: 10.1364/PRJ.387397
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Funding
- National Key Research and Development Program of China [2017YFA0205800]
- National Natural Science Foundation of China [91950110, 11774273, 11904267, 61805184, 11674256]
- Outstanding Youth Funds of Hubei Province [2016CFA034]
- Postdoctoral Innovation Talent Support Program of China [BX20180221]
- China Postdoctoral Science Foundation [2019M652688]
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The unwanted zero-order light accompanied by the birth of diffractive optical elements and caused mainly by fabrication errors and wavelength variations is a key factor that deteriorates the performance of diffraction-related optical devices such as holograms, gratings, beam shapers, beam splitters, optical diffusers, and diffractive microlenses. Here, inspired by the unique characteristic of nano-polarizer-based metasurfaces for both positive and negative amplitude modulation of incident light, we propose a general design paradigm to eliminate zero-order diffraction without burdening the metasurface design and fabrication. The experimentally demonstrated metahologram, which projects a holographic image with a wide angle of 70 degrees x 70 degrees in the far field, presents a very low zero-order intensity (only 0.7% of the total energy of the reconstructed image). More importantly, the zero-orderfree meta-hologram has a large tolerance limit for wavelength variations (under a broadband illumination from 520 to 660 nm), which brings important technical advances. The strategy proposed could significantly relieve the fabrication difficulty of metasurfaces and be viable for various diffractive-optics-related applications including holography, laser beam shaping, optical data storage, vortex beam generation, and so on. (C) 2020 Chinese Laser Press
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