Tunable Metasurface and Flat Optical Zoom Lens on a Stretchable Substrate
Tunable Metasurface and Flat Optical Zoom Lens on a Stretchable Substrate
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DOI：
10.1021/acs.nanolett.6b00618
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发表时间：
2016-04-01
期刊：
影响因子：
10.8
通讯作者：
Agarwal, Ritesh
中科院分区：
文献类型：
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作者：
Ee, Ho-Seok;Agarwal, Ritesh
通过改变在可拉伸聚二甲基硅氧烷衬底上制备的复杂金纳米棒阵列的晶格常数，在可见频率范围内证明了一种机械可重构的可连续调谐波前的超表面。结果表明，与可调超表面相互作用的可见光在632.8 nm处的反常折射角可以通过将衬底拉伸30%左右，从11.4°调节到14.9°。实现了焦距可在150 ~ 250 μ m范围内连续变化的超薄平面1.7倍变焦镜头，这也证明了利用超表面进行可重构平面光学的潜力。
A mechanically reconfigurable metasurface that can continuously tune the wavefront is demonstrated in the visible frequency range by changing the lattice constant of a complex Au nanorod array fabricated on a stretchable polydimethylsiloxane substrate. It is shown that the anomalous refraction angle of visible light at 632.8 nm interacting with the tunable metasurface can be adjusted from 11.4 degrees to 14.9 degrees by stretching the substrate by similar to 30%. An ultrathin flat 1.7X zoom lens whose focal length can continuously be changed from 150 to 250 mu m is realized, which also demonstrates the potential of utilizing metasurfaces for reconfigurable flat optics.