High-Efficiency Ultra-Violet Dielectric Meta-Holograms with Antiferromagnetic Resonances
Abstract
Metasurfaces with spatially varying subwavelength structures enable full control of electromagnetic waves over a wide spectrum. High-efficiency metasurfaces, especially in a transmission mode, are of practical significance in optical elements and systems, hitherto their operating frequencies have been expanded down to visible-wavelength ranges. Challenges of developing shorter-wavelength metasurfaces originate from electromagnetic loss caused by strong absorption for most high-refractive-index materials. Here we introduce a large-bandgap semiconductor material-niobium pentoxide (Nb2O5)-to engineer a ultraviolet meta-hologram with a total efficiency of 81% at 355nm wavelength. This meta-hologram modulates the geometric phase of transmitted circular-polarization light via orientation-varying high-aspect-ratio nano-bricks that are elaborately designed to excite antiferromagnetic resonances. We reveal that the induced antiferromagnetic modes maintain one component (e.g., Ex-component) of incident light through even-numbered antiparallel magnetic dipoles (AMDs) but reverse the other component (e.g., Ey-component) via odd-numbered AMDs, thus realizing high-efficiency polarization conversion. Our approach might open the door towards high-performance ultraviolet-light nanophotonics and meta-optics.
Keywords
Cite
@article{arxiv.1806.03131,
title = {High-Efficiency Ultra-Violet Dielectric Meta-Holograms with Antiferromagnetic Resonances},
author = {Kun Huang and Jie Deng and Hai Sheng Leong and Sherry Lee Koon Yap and Ren Bin Yang and Jinghua Teng and Hong Liu},
journal= {arXiv preprint arXiv:1806.03131},
year = {2018}
}
Comments
14 pages , 4 figures. Comments on our manuscript are welcome