Abstract
A multiband ultrathin metamaterial absorber, namely extended cross pattern with different dimensions and geometrical configurations, has being proposed. The absorption rates of extended cross-shaped absorber have been studied in THz range. The perfect absorption rate of extended cross-shaped absorber was found to be 97.25%, 99.27%, 99.68% and 98.76% at 2.128 THz, 6.088 THz, 9.17 THz and 10.8 THz, respectively. This is suitable for multiband operations, finding its application in sensing. The proposed ultrathin absorber has a thickness of 2.8 \(\upmu \)m which is 1/51-th times of the wavelength of the lowest frequency. The impedance of the proposed absorber is calculated and matched to free space impedance in these absorption regions based on impedance matching theory. The proposed absorber has promising applications in sensing, imaging and detection.
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