Resonant response in mechanically tunable metasurface based on crossed metallic gratings with controllable crossing angle

Abstract

We report on a new class of mechanically tunable planar metamaterials comprising resonating units formed by crossed metallic strip gratings. We observe a resonant response in transmission spectra of a linearly polarized wave passing through the system of crossed gratings. Each grating consists of an array of parallel metallic strips located on the top of a dielectric substrate. It is revealed that the resonant position appears to be dependent on the angle of gratings crossing. It is found out both theoretically and experimentally that the resonant shift on the frequency scale appears as a result of increasing in the length of the resonating portion of the parallelogram periodic cell formed by the crossed metallic strips with decreasing crossing angle and the proposed design can be used in new types of planar metamaterials and filters.In recent decades, a huge number of publications appeared which are related to the study of the optical properties of metamaterials. Metamaterials are composites possessing characteristics that cannot be found in nature (see, for instance, [1,2] and references therein). In such artificial systems the unit cell serves as an atom or molecule in conventional natural materials, whereas it can be adjustable through varying cell's geometry and constituents. Those of them that are produced by planar technology remains among the most promising for applications. They are also known as metasurfaces [3,4].Typically metasurfaces manifest a resonant response due to excitation of the magnetic and/or electric modes. This resonant response of metasurfaces is a cornerstone for achieving exotic behaviors which are dependent on the composition and structure of the structures' unit cell [5,6].

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