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Molecules 2018, 23(6), 1323; https://doi.org/10.3390/molecules23061323

Plate-Focusing Based on a Meta-Molecule of Dendritic Structure in the Visible Frequency

Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710129, China
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Author to whom correspondence should be addressed.
Academic Editor: Frederic Lesage
Received: 10 May 2018 / Revised: 22 May 2018 / Accepted: 28 May 2018 / Published: 31 May 2018
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Abstract

To study the potential application of metasurfaces in lens technology, we propose a dendritic meta-molecule surface (also referred to as a dendritic metasurface) and realize the focusing effect in the visible spectrum through simulations and experiments. Using asymmetric dendritic structures, this metasurface can achieve distinct broadband anomalous reflection and refraction. When the metasurface is rotated by 180° around the z axis, anomalous reflection and refraction in vertically incident optical waves are in opposite directions. Considering this feature, a metasurface is designed to achieve a prominent plate-focusing effect. Samples with a transmission peak of green light at 555 nm, yellow light at 580 nm, and red light at 650 nm were prepared using bottom-up electrochemical deposition, and the focus intensity of approximately 10% and focal length of almost 600 µm were experimentally demonstrated. View Full-Text
Keywords: dendritic structure; anomalous reflection; anomalous refraction; visible light; plate-focusing metasurface dendritic structure; anomalous reflection; anomalous refraction; visible light; plate-focusing metasurface
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cheng, S.; An, D.; Chen, H.; Zhao, X. Plate-Focusing Based on a Meta-Molecule of Dendritic Structure in the Visible Frequency. Molecules 2018, 23, 1323.

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