Journal
OPTICS EXPRESS
Volume 26, Issue 3, Pages 3594-3603Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.003594
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Funding
- National Natural Science Foundation China [61372034, 61401191]
- Natural Science Foundation of Shaanxi Province [2016JM6063]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2015A030306032]
- Guangdong Special Support Program [2016TQ03X839]
- Shenzhen Science and Technology Innovation Committee Funds [KQJSCX20160226193445, JCYJ20150331101823678, KQCX2015033110182368, JCYJ20160301113918121, JSGG20160427105120572]
- Shenzhen Development and Reform Commission Funds [[2015] 944]
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Multifunctional metasurface integrating different functions can significantly save the occupied space, although most of bifunctional metasurfaces reported to date only control the wave in either reflection or transmission regime. In this paper, we propose a scheme that allows one to independently control the reflection and transmission wavefront under orthogonal polarizations. For demonstration, we design a bifunctional metasurface that simultaneously realizes a diffusion reflection and a focusing transmission. The diffusion reflection is realized using a random phase distribution, which was implemented by randomly arranging two basic coding unit cells with the aid of an ergodic algorithm. Meanwhile, the hyperbolic phase distribution was designed to realize the focusing functionality in the transmission regime. To further show the potential applications, a high-gain lens antenna was designed by assembling the proposed metasurface with a proper feed. Both simulation and measurement results have been carried out, and the agreement between the two results demonstrates the validity of the performance as expected. The backward scattering can be reduced more than 5 dB within 6.4-10 GHz compared with the metallic plate. Moreover, the lens antenna has a gain of 20 dB (with around 13 dB enhancement in comparison with the bare feeding antenna) and an efficiency of 32.5%. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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