Abstract-Magnetic-coupling induced transparency in a planar terahertz metamaterial

Ming Li Wan

Corresponding author.

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

Shu Qing Yuan

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

Yue Li Song

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

New Pv-energy Engineering Research Center, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

Yong Li

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

Mingli Tian

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

Feng Qun Zhou

Electric and Information Engineering College, Pingdingshan University, Pingdingshan, Henan Province 467000, P. R. China

 http://www.worldscientific.com/doi/abs/10.1142/S0217979215501143?src=recsys&

In this paper, we demonstrate that an electromagnetically induced transparency (EIT)-like behavior is induced by the coupling of two magnetic resonances in a planar terahertz (THz) metamaterial structure, which consists of a U-shaped split ring (USR) as one bright resonator and a cut wire pair (CWP) as one dark resonator. It is found that the EIT-like spectral response is insensitive to the lateral distance between the two magnetic resonators, whereas an on-to-off modulation of the amplitude of the transparency window can be achieved by moving the USR vertically along the CWP. The underlying physical mechanism is mainly attributed to magneto-inductive excitation of the CWP. This investigation may provide an insight of the role of magnetic coupling in achieving EIT-like effect, inspiring interest in the developments of magnetically tunable transparency metamaterial for a wide range of optical devices with switching and modulation capabilities.