期刊
EPL
卷 101, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/101/54002
关键词
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资金
- NSFC [60990321, 11174055]
- Program of Shanghai Subject Chief Scientist [12XD1400700]
- MOE of China [B06011]
It was shown in a recent work (SUN S. et al., Nat. Mater., 11 (2012) 426) that an ideal gradient meta-surface (GM) can convert an incident propagating wave (PW) to an obliquely outgoing PW or even a surface wave (SW) with nearly 100% efficiency. Here, based on non-ideal GM systems, we systematically studied the factors that influence the efficiencies of such conversion processes (both PW-PW and PW-SW). We found that while intra-supercell impedance-mismatch can hardly affect the conversion efficiencies, the scatterings caused by inter-supercell discontinuities can have non-negligible effects on the PW-SW conversion efficiency. We proposed a new GM model that can reduce the scatterings so as to improve the PW-SW conversion efficiency. Finally, we demonstrated that a GM containing only 2 supercells can convert a PW to a SW with very high efficiency, while a grating coupler of the same size does not work at all. Copyright (c) EPLA, 2013
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