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arXiv 1909.07941physics.optics
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一种混合消色差超透镜

A Hybrid Achromatic Metalens

Fatih Balli, Mansoor A. Sultan, Sarah K. Lami, Jeffrey T. Hastings

摘要:

超材料和超表面被广泛用于操纵宽波长范围内的电磁波。最近的几项努力集中在超透镜上,超透镜是使用亚波长结构聚焦光的超薄光学元件。与其折射对应物相比,超透镜提供减小的尺寸和重量、改进的可制造性以及诸如偏振控制的新功能。然而,校正色差的超透镜也遭受显著降低的聚焦效率。在这里,我们介绍了一种混合消色差金属透镜(HAML),它克服了这种权衡,并提供了从1000 - 1800 nm的宽波长范围内提高聚焦效率。所制造的HAML在数值孔径(NA)为0.27、0.11和0.06时表现出衍射极限性能,具有平均聚焦效率$> 60\%$和最大效率~ $ 80\%$。HAML可以通过结合递归射线跟踪和模拟相位库而不是计算密集型全局搜索算法来设计。此外,HAML可以使用用于定制的多光子光刻或使用用于大规模生产的模制在低折射率材料中制造。

英文摘要:

Metamaterials and metasurfaces are widely used to manipulate electromagnetic waves over a broad range of wavelengths. Several recent efforts have focused on metalenses, ultra-thin optical elements that focus light using subwavelength structures. Compared to their refractive counterparts, metalenses offer reduced size and weight, improved manufacturability, and new functionality such as polarization control. However, metalenses that correct chromatic aberration also suffer from markedly reduced focusing efficiency. Here we introduce a Hybrid Achromatic Metalens (HAML), that overcomes this trade-off and offers improved focusing efficiency over a broad wavelength range from 1000 - 1800 nm. Fabricated HAMLs demonstrated diffraction limited performance for numerical apertures (NA) of 0.27, 0.11, and 0.06 with average focusing efficiencies $> 60\%$ and maximum efficiencies ~ $ 80\%$. HAMLs can be designed by combining recursive ray-tracing and simulated phase libraries rather than computational intensive global search algorithms. Moreover, HAMLs can be fabricated in low-refractive index materials using multi-photon lithography for customization or using molding for mass production.

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