Terahertz (THz) plasmonic structures with surface plasmon polaritons (SPPs) based on periodic metal holes or slits have been investigated in the decade. THz electromagnetic waves can thus be trapped at the structural apertures with characteristic surface field, resembling the SPPs of normal metal. Therefore, THz plasmonic devices based on the surface-confined field can be applied for the optical sensing or spectral filter because of the response beyond the performance in free-space condition. In recent years, Fano resonances have been introduced as one important effect due to its superior characteristics with asymmetric and sharp spectral response [1-3]. Woven steel meshes were studied for the microwaves and THz waves due to the flexibility and deformable functions [4, 5]. The THz spectroscopic analysis on the meshes is revealed, but Fano resonance induced from the mesh structure has not found yet [4, 5]. In this paper, the metal wire woven mesh (MWWM) is experimentally investigated in the transmission spectrum of 0.1-1 THz and presented as a THz plasmonic structure with localized resonance field.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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