Abstract
In this paper, a single band metamaterial filter with two metal layers is proposed and measured in terahertz (THz) frequency. A transmission peak with 89% amplitude is achieved at resonance frequency 2.95 THz. The measured full width at half maximum (FWHM) is 0.19 THz and the measured quality factor Q is 15.5. Calculated results show that the transmission peak is caused by the bright-bright modes coupling effect, also known as plasmon-induced-transparency effect (PIT). A metamaterial filter with single metal layer is also measured. Measured results show that the transmission of the proposed THz metamaterial filter can be enhanced by the PIT effect. In the first experiments, the transmission peak is reduced from 89% to 64% with the dielectric thickness increasing. In the second experiments, the transmission peak is enhanced from 89% to 99%, than reduce to 75.7%, with the radius increasing. In the third experiments, the transmission peak is almost unchanged with the lattice constant increasing.
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