Abstract
In this work, a broadband terahertz asymmetric transmission metamaterial is experimentally demonstrated for a linearly polarized wave. The measured transmission coefficient Tyx is larger than 0.6 from 0.55 to 0.82 THz, and reaches a peak value of 0.714 at 0.62 THz, while the transmission coefficient Txy is lower than 0.2 from 0.4 to 0.9 THz. The calculated asymmetric transmission parameter of the measurement ranges from 0.53 to 0.84 THz for magnitudes over 0.4. The peak value reached 0.65 at the frequency of 0.78 THz. The physical mechanism of the polarization conversion was also analyzed from the distributions of the surface currents and electric fields.
Highlights
Metamaterials possess novel electromagnetic properties and can be periodically structured with unit cells
Since Pendry et al reported negative refraction by utilizing chirality in 2004,4 chiral metamaterials have attracted the attention of many researchers
Many new properties have been found in the chiral metamaterials, such as asymmetric transmission (AT), circular dichroism and optical activity
Summary
Singh et al.[13] presented experimental and numerical evidence of the AT of a circularly polarized terahertz wave through a planar chiral metamaterial for the rst time. Kenney et al.[16] fabricated a herringbone metasurface to realize a broadband asymmetry between the orthogonal circular polarizations with a cross-polarization transmittance of 0.62. Liu et al.[17] demonstrated a temperaturecontrolled AT of linearly polarized THz waves by exploiting the insulator-to-metal phase transition of VO2. A two-dimensional chiral structure with broken symmetry was experimentally demonstrated to realize a broadband AT effect for linearly polarized waves in the terahertz band. The transmitted waves polarized in the y direction when the incident wave is x-polarized, Tyy and Txy are de ned in the same way
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