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Tunable Duplex Metalens Based on Phase-Change Materials in Communication Range

1
The Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Center of Material Science, National University of Defense Technology, Changsha 410073, China
3
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 993; https://doi.org/10.3390/nano9070993
Received: 30 May 2019 / Revised: 6 July 2019 / Accepted: 9 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Nanophotonics and Its Applications)
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PDF [3753 KB, uploaded 10 July 2019]
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Abstract

Metalenses recently have attracted attention because of their more compact size in comparison with conventional lenses; they can also achieve better optical performance with higher resolution. Duplexer is an interesting function of a metalens that can distinguish different sources and divide them into two parts for specific purposes. In this article, we design tunable duplex metalenses with phase-change material Ge2Sb2Te5 for the first time. Two types of special unit cells are designed to modulate the incident lights, and four metalenses are designed based on the two types of unit cells. Specific phase profiles are calculated for different sections of metalens in which the corresponding unit cells are settled; accordingly, the metalenses can focus the incident lights at any positions according to our design. Moreover, the metalenses become selectable via tuning the state of phase-change material, which means that the output light field can be actively controlled. The proposal of our tunable duplex metalenses will offer new opportunities for active three-dimensional imaging or optical coding. View Full-Text
Keywords: duplex metalens; tunable; phase change materials; phase modulation; nano device duplex metalens; tunable; phase change materials; phase modulation; nano device
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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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Bai, W.; Yang, P.; Wang, S.; Huang, J.; Chen, D.; Zhang, Z.; Yang, J.; Xu, B. Tunable Duplex Metalens Based on Phase-Change Materials in Communication Range. Nanomaterials 2019, 9, 993.

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