Abstract
In this article, an ultrathin terahertz dual band metamaterial absorber made up of patterned asymmetrical double-split rings and a continuous metal layer separated by a thin FR-4 layer is designed. Simulation results show that two almost identical strong absorption peaks appear in the terahertz band. When the incident electric field is perpendicular to the ring gaps located at 11 μm asymmetrically, the absorptivity of 98.6% at 4.48 THz and 98.5% at 4.76 THz can be obtained. The absorption frequency and the absorptivity of the absorber can be modulated by the asymmetric distribution of the gaps. The perfect metamaterial absorber is expected to provide important reference for the design of terahertz modulator, filters, absorbers, and polarizers.
Highlights
Metamaterials have aroused considerable research interests in the past decades, owing to their unique properties that cannot be found in nature materials [1]
Since metamaterials have been used extensively to make absorbers because of their unique characteristics that are different from the conventional ones
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Summary
Metamaterials have aroused considerable research interests in the past decades, owing to their unique properties that cannot be found in nature materials [1]. It is generally known that absorbing characteristics of the conventional absorbers are determined by natural properties of the bulk materials [12] Based on these benefits, many metamaterial perfect absorbers have been widely studied and successfully used, such as bolometers [13], chemical and biomedical sensing [14], photodetector [15], photothermal conversion [16], and so on
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