Abstract
In a recent publication, Lu et al [...].
Highlights
Lu et al [1] proposed a dual-band perfect metamaterial absorber based on an asymmetric H-shaped structure for terahertz waves
We demonstrate that the authors erroneously interpreted cross-polarizer as a dual-band absorber. By including both polarized reflection coefficients, the absorption decreases from 99.91%
It is worth mentioning that the authors designed the absorber on FR-4 substrate, which is commonly used in ideal conditions
Summary
Lu et al [1] proposed a dual-band perfect metamaterial absorber based on an asymmetric H-shaped structure for terahertz waves. We demonstrate that the authors erroneously interpreted cross-polarizer as a dual-band absorber. By including both polarized reflection coefficients (co- and cross-), the absorption decreases from 99.91% The polarization conversion ratio (PCR) is approaching 85% at a resonance frequency of 5 THz, which shows that the proposed metasurface is a cross-polarizer rather than an absorber.
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