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.
Highlights
Induced transparency (EIT) is originally observed in atomic physics and arises due to quantum interference effect, resulting in a narrow transmission window inside an absorption band[1]
We propose and demonstrate a mirror-like symmetrical unit cell of metamaterial to generate an electromagnetically induced transparency (EIT) analogue with high extinction ratio
To explore the physical origin of symmetrically near-field coupled bright-dark-dark-bright metamaterial, the widely used coupled resonator model is adapted to analyze the interaction between the four split-ring resonators (SRRs) elements in the unit cell[28, 29]
Summary
Induced transparency (EIT) is originally observed in atomic physics and arises due to quantum interference effect, resulting in a narrow transmission window inside an absorption band[1]. Two bright resonators can be strongly excited by the incident wave, while two dark resonators can only be excited through near field coupling with bright SRRs. Compared to the conventional bright-dark coupling of two SRRs, the symmetrical arrangement of two dark modes induces highly suppression of their own electric and magnetic dipole radiation losses, and extraordinarily high ER transmission.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
