International audienceWe present an original design of anisotropic metamaterial plates exhibiting extraordinary transmission through perfectly conductor metallic screens perforated by a subwavelength double-pattern rectangular aperture array. The polarization properties of the fundamental guided mode inside the apertures are at the origin of the anisotropy. The metal thickness is a key parameter that is adjusted in order to get the desired value of the phase difference between the two transversal electromagnetic field components. As an example, we treat the case of a half-wave plate having 92% transmission coefficient. Such a study can be easily extended to design anisotropic plates operating in terahertz or microwave domains
We propose the design of a three-dimensional anisotropic chiral structure composed of double-layered metallic films. Each layer behaves as a half-wave plate thanks to the excitation and the propagation of guided modes inside the subwavelength apertures of each metallic layer. As in conventional optics, the optical rotation is tuned by simply changing the angle between the two plates. We numerically demonstrate that this property remains valid only if the whole second layer is rotated instead of twisting every pattern. Therefore, the plane of polarization can be rotated by any desired value and is accompanied by a transmission up to 80%. The proposed structure opens the way to the design of a new kind of chiral plate in the terahertz or microwave domains.
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