Effects of roughness and resonant-mode engineering in all-dielectric metasurfaces
| Autor: | He Liu, Yuanrui Li, Yunxiang Wang, Wei Wu, Buyun Chen, Tse-Hsien Ou, Michelle L. Povinelli, Pan Hu, Hao Yang, Deming Meng, Boxiang Song |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
QC1-999 Physics::Optics hybrid metasurface 02 engineering and technology Surface finish Dielectric resonant-mode engineering 010402 general chemistry 01 natural sciences Nanomaterials all-dielectric metasurface Electrical and Electronic Engineering roughness business.industry Physics high-contrast grating Mode (statistics) 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Optoelectronics 0210 nano-technology business Biotechnology |
| Zdroj: | Nanophotonics, Vol 9, Iss 6, Pp 1401-1410 (2020) |
| ISSN: | 2192-8614 2192-8606 |
| Popis: | The development of all-dielectric metasurfaces vigorously prompts the applications of optical metasurfaces for the visible and near-IR light range. Compared to IR or longer wavelength light, visible and near-IR light have shorter wavelengths. As a result, surface roughness and imperfections of all-dielectric metasurfaces have larger scattering or absorption of visible and near-IR light, thereby directly affecting the performance of an all-dielectric metasurface. In this article, a volume-current method is adopted to study the effect of metasurface roughness. Numerical calculations based on the finite difference time domain (FDTD) method are also used to study the relationship between the effects of metasurface roughness and the optical resonant modes. Numerical predictions based on our theoretical studies fit the experimental data well. Further, the effect of different roughness levels on the all-dielectric metasurface performance is predicted. More importantly, a method utilizing resonant-mode engineering to enhance the metasurface performance (e.g. incident angle insensitivity) is also proposed and demonstrated. This work deepens our understanding of the working mechanism of all-dielectric metasurfaces and paves the way for their use in a broad spectrum of applications. |
| Databáze: | OpenAIRE |
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