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. 2017 Mar 6;7:43723. doi: 10.1038/srep43723

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Copyright © 2017, The Author(s)

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(a) Scheme of the VIM metagrating in the metal phase. The proposed VIM metagrating is formed by periodic arrangement of 7 asymmetric VIM nanoantennas with a period of 932 nm. E_y-field profiles in (b) insulator and (c) metal phases, respectively. Magnitude profiles of transverse magnetic fields in (d) insulator and (e) metal phases, respectively. Tightly focused Gaussian beams with a waist of 5 μm are imposed in common for the calculations of (b–e). Left to right power distinction ratio of backside SPPs in the insulator phase, as depicted graphically in (b,d), is about 8.13. Right to left power distinction ratio of backside SPPs in the metal phase, as depicted graphically in (c,e), is about 10.56.