期刊
OPTICS LETTERS
卷 42, 期 13, 页码 2639-2642出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.42.002639
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资金
- European Research Council (ERC) [639109]
- Agency for Science, Technology and Research (A*STAR) [152-73-00025]
- European Research Council (ERC) [639109] Funding Source: European Research Council (ERC)
We designed and simulated freestanding dielectric optical metasurfaces based on arrays of etched nanoholes in a silicon membrane. We showed 2 pi phase control and high forward transmission at mid-infrared (mid-IR) wavelengths around 4.2 mu m by tuning the dimensions of the holes. We also identified the mechanisms responsible for high forward scattering efficiency and showed that these conditions are connected with the well-known Kerker conditions already proposed for isolated scatterers. A beam deflector was designed and optimized through sequential particle swarm and gradient descent optimization to maximize transmission efficiency and reduce unwanted grating orders. Such freestanding silicon nanohole array metasurfaces are promising for the realization of silicon-based mid-IR optical elements. (C) 2017 Optical Society of America
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