High extinction ratio electromagnetically induced transparency analogue based on the radiation suppression of dark modes

Abstract

A high extinction ratio (ER) electromagnetically induced transparency (EIT) analogue based on single-layer metamaterial is designed and experimentally demonstrated in this paper. This design involves four mirror-like symmetrically coupled split ring resonators (SRRs) that exhibit a bright-dark-dark-bright mode configuration. The EIT-like effect is realized by coupling between the bright resonators and dark resonators. The high ER feature is achieved from the suppression of radiative losses, due to opposite directions of electric and magnetic dipoles of two dark modes in the unit cell. Classical coupled resonator model is used to theoretically analyze the device transmission performances and to characterize parameter influence of the ER. Both numerical simulation and experiment results demonstrate that the ER of this device can reach more than 21 dB, which is 11 dB higher than that of conventional bright-dark coupling SRR arrangement. Finally, the potential multi-channel sensing utility of this device is demonstrated to show the importance of high ER feature.

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“…Plasmon induced transparency (PIT) is similar effect as EIT which has been proposed in variety of plasmonic structures. Recently, PIT has been investigated by several groups based on metallic nanoparticles [2,3] and metamaterial structures [4,5]. The design based on metamaterials structure are realized by destructive interference of dark-bight modes and detuning of two bright modes to achieve PIT response.…”