Journal
MATERIALS
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/ma10060591
Keywords
perfect metamaterial absorber; terahertz; six-band; cave-cross patch resonator
Categories
Funding
- National Natural Science Foundation of China [U1435209, 61605147]
- Youth science and technology backbone cultivation plan project of the Wuhan University of Science and Technology [2016xz010]
- Natural Science Foundation of Hubei China [ZRMS2017000284]
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A simple design of an ultrathin six-band polarization-insensitive terahertz perfect metamaterial absorber (PMMA), composed of a metal cross-cave patch resonator (CCPR) placed over a ground plane, was proposed and investigated numerically. The numerical simulation results demonstrate that the average absorption peaks are up to 95% at six resonance frequencies. Owing to the ultra-narrow band resonance absorption of the structure, the designed PMMA also exhibits a higher Q factor (>65). In addition, the absorption properties can be kept stable for both normal incident transverse magnetic (TM) and transverse electric (TE) waves. The physical mechanism behind the observed high-level absorption is illustrated by the electric and power loss density distributions. The perfect absorption originates mainly from the higher-order multipolar plasmon resonance of the structure, which differs sharply from most previous studies of PMMAs. Furthermore, the resonance absorption properties of the PMMA can be modified and adjusted easily by varying the geometric parameters of the unit cell.
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