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. 2014 May 9;4:4901. doi: 10.1038/srep04901

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(a) Absorbance and normalized skin depth (NSD) versus t_s. The purple curves show the peak absorbance in the spacer region. The green curves show the total absorbance in the metallic regions. Orange curve shows the skin depth normalized with respect to its maximum value of 53 nm at t_s = 15 nm. stands for absorbance in spacer (i = s) or metallic regions (i = m) for different values j of the spacer. NSD is calculated at . and t_g = 245 nm. (b) Effective surface impedance of the metamaterial absorber and NSD [repeated from (a)] versus t_s calculated near the total absorbance peak for ε₁ = 0.86 + 1.23 j and t_g = 245 nm. (c) The percentage of total absorbance in different regions of the metamaterial absorber corresponding to (a) and NSD versus t_s. stands for the percentage of total absorbance in region i for different values j of the spacer.

Inline graphic — (a) Absorbance and normalized skin depth (NSD) versus t_s. The purple curves show the peak absorbance in the spacer region. The green curves show the total absorbance in the metallic regions. Orange curve shows the skin depth normalized with respect to its maximum value of 53 nm at t_s = 15 nm. stands for absorbance in spacer (i = s) or metallic regions (i = m) for different values j of the spacer. NSD is calculated at . and t_g = 245 nm. (b) Effective surface impedance of the metamaterial absorber and NSD [repeated from (a)] versus t_s calculated near the total absorbance peak for ε₁ = 0.86 + 1.23 j and t_g = 245 nm. (c) The percentage of total absorbance in different regions of the metamaterial absorber corresponding to (a) and NSD versus t_s. stands for the percentage of total absorbance in region i for different values j of the spacer.