Search

Spoof surface plasmon-polariton is a type of surface wave propagating at the artificially engineered structures in microwave and terahertz ranges. These surface waves are highly important in planar photonic and on-chip devices, integrated circuits, lenses, sensors, and antennas applications. However, it is still a challenge to control the propagation regime of such surface waves including the wavefront shapes and propagation directions. In this letter, we study the surface waves in bilayer hyperbolic metasurfaces and show that interplay between two layers allows to manage their regime of propagation. We demonstrate the switching between angle and number of propagation directions of surface waves at the same frequency. Finally, we demonstrate experimentally the tunable multidirectional in-plane canalization of surface waves by adjusting directions of their propagation with angular range from 0 to 12.8 degrees. The discovered rotation-mediated interlayer coupling of hyperbolic metasurfaces paves way towards efficient in-plane transfer of localized electromagnetic signal.

The manuscript is devoted to experimental and numerical calculation analysis of the spectral properties of an anisotropic wire medium (wire photonic crystal) with embedded spatial defect in microwaves. The spatial distribution of the electromagnetic field in the defect region is experimentally detected. A good agreement between theoretical calculations and experimental measurements is shown. The obtained experimental results can be applied for various areas in Communications: directional couplers, high pass filters, attenuators, etc.

We present an experimental and numerical simulation analysis of the spectral properties of two-dimensional photonic band gap (PBG) wire structure with a spatial defect in the millimeter waveband. The localized defective modes are experimentally detected in the band gap transmission spectrum of 2D PBG wire structure. The quality factor and radiation pattern of the defect modes and their dependence on the number of wire rows are investigated. A good agreement between the experiment and theory is demonstrated. The research results can be used in the development of various telecommunication devices: high pass filters, directional couplers, attenuators, electromagnetic sensors, etc.

The paper is devoted to experimental and theoretical study of the spectral characteristics of anisotropic wire medium with tunable 2D unit-cell dimensions. We experimentally demonstrate possibility of the effective spectral characteristics control of the wire medium by varying the 2D unit-cell dimensions. In addition, we show that depending on geometric parameters of the unit-cell wire medium can operate both as high-pass filter, and as a band gap structure. We underline that investigated structure with rectangular unit-cell is a plasmonic-type medium under conditions λ p /b=3. At lower values the wire medium is the electromagnetic band gap crystal.

The paper is devoted to the experimental study of the spectral characteristics of matrix anisotropic structures formed by different type of metamaterial. During the analysis of the spectrum of the structures under investigation the manifestation of spatial anisotropy for different orientations of the wave vector k in the structure has been discovered. This phenomenon is explained by changes of the geometric parameters of metallic inclusions in these structures. Thus increasing the length of the metal inclusions leads to an increase of spatial anisotropy for the both selected different orientations of the wave vector k.