Polarization-selective electromagnetically induced transparency in asymmetric mid-infrared plasmonic metamaterials

The Linh Pham; Nguyen Hai Anh; Nguyen Thi Mai; Vu Dinh Lam; Ewald Janssens; Nguyen Thanh Tung

doi:10.15625/0868-3166/23333

Author affiliations

Authors

The Linh Pham Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven 3001, Belgium https://orcid.org/0000-0001-8482-3204
Nguyen Hai Anh Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi, Vietnam
Nguyen Thi Mai Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi, Vietnam
Vu Dinh Lam Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do, Hanoi, Vietnam
Ewald Janssens Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven 3001, Belgium
Nguyen Thanh Tung Institute of Materials Science, VAST

DOI:

https://doi.org/10.15625/0868-3166/23333

Keywords:

infrared, metamaterials, plasmonic, strong coupling, electromagnetically induced transparency

Abstract

We demonstrate polarization-controlled electromagnetically induced transparency (EIT) in asymmetric H-shaped plasmonic metamaterials operating in the mid-infrared regime (5-16 μm). Through controlled symmetry breaking of coupled gold cut-wire resonators, we achieve strong coupling between bright (superradiant) and dark (subradiant) modes, evidenced by an anti-crossing behavior in the reflectance spectrum. Fourier-transform infrared spectroscopy reveals a tunable transparency window with up to 55% reflectance suppression under TE polarization, while a single plasmonic resonance is maintained under TM-polarized excitation. Finite-integration technique simulations and field distribution analysis confirm the hybridized nature of the observed states, showing quadrupole-dipole mode interaction. The polarization-selective EIT response emerges from coupling between vertical and horizontal resonators whose coupling strength is systematically controlled via lateral displacement (0-0.2 μm) of the vertical resonator. This work establishes a robust platform for tunable mid-infrared photonics, bridging quantum-inspired phenomena with practical metamaterial design for applications in molecular sensing, active optical components, and quantum plasmonics.

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