Asymmetric planar terahertz metamaterials

Abstract

We report an experimental observation of three distinct resonances in split ring resonators (SRRs) for both vertical and horizontal electric field polarizations at normal incidence by use of terahertz time domain spectroscopy. Breaking the symmetry in SRRs by gradually displacing the capacitive gap from the center towards the corner of the ring allows for an 85% modulation of the fundamental inductive-capacitive resonance. Increasing asymmetry leads to the evolution of an otherwise inaccessible high quality factor electric quadrupole resonance that can be exploited for bio-sensing applications in the terahertz region.

8 pages, 5 figures

References in corpus (4)

• A metamaterial absorber for the terahertz regime: Design, fabrication and characterization
• Analogue of Electromagnetically Induced Transparency in a Terahertz Metamaterial
• Coupling between a dark and a bright eigenmode in a terahertz metamaterial
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Cited by in corpus (5)

• Ultrasensitive THz sensing with high-Q Fano resonances in metasurfaces
• Strong influence of packing density in terahertz metamaterials
• Controlling metamaterial resonances via dielectric and aspect ratio effects
• Polarization-dependent electromagnetic responses of ultrathin and highly flexible asymmetric terahertz metasurfaces
• Energy Coupled Mode Theory for an arbitrary number of resonators