Sharp resonances in terahertz free-standing three-dimensional metallic woven meshes

Free-standing structures that do not require any holder or substrate show high levels of flexibility and stretchability and hence are well-suited for THz applications. In this work, a free-standing three-dimensional metallic woven mesh is experimentally and numerically investigated at terahertz frequencies. Such mesh fabricated by weaving techniques exhibits sharp Fano-like resonances, which has not been found in previous studies. Investigation results indicate that the high Q resonances originate from the bending effect in bent wires, which can be termed as Wood's anomalies. The resonance field longitudinally covers the input and output end faces of the woven mesh, thereby obtaining a large field volume. These properties in this kind of meshes are well suited for wave manipulation and biomolecular sensing in the terahertz regime.