Resonant Response in Mechanically Tunable Metasurface based on Crossed Metallic Gratings with Controllable Crossing Angle

TL;DR

This paper introduces a mechanically tunable metasurface with crossed metallic gratings, demonstrating controllable resonance shifts dependent on crossing angle, with potential applications in planar metamaterials and filters.

Contribution

It presents a novel design of tunable planar metamaterials using crossed metallic gratings with angle-dependent resonant properties, supported by theoretical and experimental analysis.

Findings

Resonant frequency shifts with crossing angle changes.

Experimental validation of theoretical resonance predictions.

Potential for new planar metamaterial and filter designs.

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.