Polarization-dependent electromagnetic responses of ultrathin and highly flexible asymmetric terahertz metasurfaces

Abstract

We report the polarization-dependent electromagnetic response from a series of novel terahertz (THz) metasurfaces where asymmetry is introduced through the displacement of two adjacent metallic arms separated by a distance $\delta$. For all polarization states, the symmetric metasurface exhibits a low quality (Q) factor fundamental dipole mode. By breaking the symmetry, we experimentally observe a secondary dipole-like mode with a Q factor nearly $9\times$ higher than the fundamental resonance. As $\delta$ increases, the fundamental dipole mode $f_1$ redshifts and the secondary mode $f_2$ blueshifts creating a highly transmissive spectral window. Polarization-dependent measurements reveal a full suppression of $f_2$ for all asymmetries at $\theta \ge 60^{\circ }$. Furthermore, at $\delta \ge 60\mu \text{m}$, we observe a polarization selective electromagnetic induced transparency (EIT) for the fundamental mode. This work paves the way for applications in filtering, sensing and slow-light devices common to other high Q factor THz metasurfaces with EIT-like response.

9 pages, 5 figures

References in corpus (4)

• Ultrasensitive THz sensing with high-Q Fano resonances in metasurfaces
• Tailoring the slow light behavior in terahertz metasurfaces
• Terahertz metamaterials on free-standing highly-flexible polyimide substrates
• Lattice Induced Transparency in Metasurfaces

Cited by in corpus (2)

• Electromagnetically induced transparency control in terahertz metasurfaces based on bright-bright mode coupling
• Tunable High-Quality Fano Resonance in Coupled Terahertz Whispering-Gallery-Mode Resonators