Abstract
In this paper, a deep numerical as well as experimental study of the anisotropy response of extraordinary transmission metamaterials constructed by stacking subwavelength hole arrays is presented. Two-dimensional (2D) dispersion diagrams for S- and P-polarization were obtained from simulation. From them, it was found that negative refraction can be obtained for the latter case for small angles of incidence. Additionally, it was found that double periodic and dielectric loaded hole arrays are optimal to enlarge the numerical aperture that leads to negative refraction. Several experiments are then presented in the V-band of the millimetre-wave range that show excellent agreement with the numerical calculations. Moreover, the richness of the anisotropic characteristic exhibited by the stacked hole array structure allows for designing structures with complex electromagnetic response other than solely negative refraction. Thus, the results presented here could be taken as a novel route to achieve exotic behaviour, such as negative refraction at other frequency ranges, like terahertz or the visible.
Highlights
In this paper, a deep numerical as well as experimental study of the anisotropy response of extraordinary transmission metamaterials constructed by stacking subwavelength hole arrays is presented
For S/P measurements, a horizontally/vertically polarized pure Gaussian beam [29] was generated by a transmitting corrugated horn antenna (Tx)—the polarization of the incident wave is modified because, as mentioned above, the electric field must have a transversal component parallel to the large hole array periodicity to excite regular extraordinary optical transmission (EOT) and, for simplicity in the experimental procedure, the wafers are always tilted with respect to the reference plane given by the floor
In this paper we presented an in-depth analysis of the rich anisotropic characteristics of extraordinary transmission metamaterials made by stacking extraordinary transmission hole arrays
Summary
A deep numerical as well as experimental study of the anisotropy response of extraordinary transmission metamaterials constructed by stacking subwavelength hole arrays is presented. We extend the results of [28], and we show that the stacked hole array structure has a strongly anisotropic character and that its optical properties rely on the wave polarization and the angle of incidence.
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