تقرير
High-Efficiency Ultra-Violet Dielectric Meta-Holograms with Antiferromagnetic Resonances
| العنوان: | High-Efficiency Ultra-Violet Dielectric Meta-Holograms with Antiferromagnetic Resonances |
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| المؤلفون: | Huang, Kun, Deng, Jie, Leong, Hai Sheng, Yap, Sherry Lee Koon, Yang, Ren Bin, Teng, Jinghua, Liu, Hong |
| سنة النشر: | 2018 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Optics |
| الوصف: | 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. Comment: 14 pages , 4 figures. Comments on our manuscript are welcome |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1806.03131 |
| رقم الأكسشن: | edsarx.1806.03131 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |