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. 2016 Apr 5;6:24063. doi: 10.1038/srep24063

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(a) Electric (blue dash-dot curve) and magnetic field (red dash-dot curve) intensity enhancement at a point in the middle of the gap and height t/2 over the silver film, and electric field intensity enhancement at height t (blue curve). (b) Diluted electric field intensity enhancement (circles connected with solid lines) and the peak absorptivity (squares connected with dashed lines) as the period varies. Inset: resonant wavelength vs period with other parameters unchanged.