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. 2017 May 18;7:2092. doi: 10.1038/s41598-017-01781-6

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© The Author(s) 2017

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(a) Frequency sensitivity with varying the metal thickness of the MMs structure, the red dotted line is the maximum sensitivity. (b) The Q factor and sensitivity varied with the metal thickness. (c,d) Electric field intensity (|E _x|) distributions of the sharp resonance mode with the metal thicknesses of 1 μm, 3 μm and 5 μm, respectively.