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(a) The triple-band metamaterial absorber structure. The metallic ground plane and subwavelength particles (white) are aluminum and the spacer (yellow) between them is polyimide. The side lengths of subwavelength particles on the top layer are denoted as w 1, w 2, and w 3, the line widths are all set as w, and the periods in both dimensions are the same and are denoted as a. (b) The optical microscopy image of a portion of the fabricated structure. The inset in (b) shows the enlarged unit cell.
Comparison among the experimental absorption (red line), full-wave simulated absorption (blue line), and multi-reflection theoretically predicted absorption (black line) of the terahertz triple-band metamaterial absorber.
(a) The physical model to compute the complex reflection and transmission coefficients at interfaces. (b) The simulated magnitudes; and (c) phases of the reflection and transmission coefficients for the decoupled model. The coefficients of are the magnitudes (phases) of reflection and transmission as the incident wave reaches at the air/PRS/spacer. The coefficients of are the magnitudes (phases) of reflection and transmission of the wave reflected by the ground plane reaching spacer/PRS/air. is the phase delay caused by the round propagation in the spacer.
The simulated absorption spectra for (a) TE and (b) TM polarizations, respectively.
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