Plasmonic Lattice Lenses for Multiwavelength Achromatic Focusing
Plasmonic Lattice Lenses for Multiwavelength Achromatic Focusing
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DOI：
10.1021/acsnano.6b05855
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发表时间：
2016-11-01
期刊：
影响因子：
17.1
通讯作者：
Odom, Teri W.
中科院分区：
文献类型：
--
作者：
Hu, Jingtian;Liu, Chang-Hua;Odom, Teri W.
本文介绍了一种基于亚波长等离子体纳米粒子的平面多波长消色差透镜的进化设计方法。我们的晶格演化算法通过调整离散方形晶格上相位单元的排列来实现期望的光学响应。晶格透镜由单一类型的纳米粒子组成，通过调整局部表面等离子体共振，可以在可见光到近红外波段（540-1000 nm）的任何波长范围内工作。当单晶胞扩展成各向异性粒子形状时，平面光学元件可以根据入射光的偏振选择性聚焦光。最后，该算法实现了高效的多目标优化，并利用多种不同的纳米粒子形状生产出了三个波长（λ = 600 nm, λ = 785 nm和λ = 980 nm）的消色差晶格透镜。
This paper describes an evolutionary approach to design flat multiwavelength achromatic lenses based on subwavelength plasmonic nanoparticles. Our lattice evolution algorithm achieved desired optical responses by tuning the arrangement of the phase units on a discrete square lattice. Lattice lenses consisting of a single type of nanoparticle could operate at any wavelength in the visible to near-infrared regime (540-1000 nm) by tailoring the localized surface plasmon resonance. When the unit cells were expanded to anisotropic particle shapes, the planar optics could selectively focus light depending on the polarization of incident light. Finally, the algorithm realized efficient multiobjective optimization and produced achromatic lattice lenses at up to three wavelengths lambda = 600 nm, lambda = 785 nm, and lambda = 980 nm) using multiple different nanoparticle shapes.