Abstract
The propagation characteristics of spoof surface plasmon modes are studied in both real and reciprocal spaces. From the metallic square lattice, we obtain constant frequency contours by directly measuring electric fields in the microwave frequency regime. The anisotropy of the measured constant frequency contour supports the presence of the negative refraction and the self-collimation which are confirmed from measured electric fields. Additionally, we demonstrate the spoof surface plasmon beam splitter in which the splitting ratio of the self-collimated beam is controlled by varying the height of rods.
Highlights
In the visible wavelength regime, electromagnetic (EM) surface waves can be formed at the interface between the dielectric and the metal
At terahertz and microwave frequencies, there are no surface waves which are tightly bound at the metal-dielectric interface because metals can often be treated as perfect electric conductors
Recent studies have shown that surface waves on the structured metal with arrays of sub-wavelength holes or rods are strongly confined at these frequencies
Summary
In the visible wavelength regime, electromagnetic (EM) surface waves can be formed at the interface between the dielectric and the metal (i.e., surface plasmons [1]). In artificial periodic structures, the constant frequency contour (CFC) has been employed in understanding unusual light propagation phenomena, i.e., self-collimation [11,12,13,14], directive emission [15,16], superprism [17], negative refraction [18,19,20,21,22], and sub-wavelength imaging [23,24,25]. The detector antenna is mounted on an xy-motorized stage to measure the S-parameters at any given point
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