META 2021, META'12

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Terahertz plasmonic metamaterial waveguides and devices
Xiaopeng Shen, Tie Jun Cui

Last modified: 2012-01-03

Abstract


Surface plasmon polaritons (SPPs) have attracted great attentions owing to their ability to spatially confine electromagnetic waves on metal surfaces beyond the diffraction limit. However, most metals support well-confined SPPs only at the optical and near-infrared frequencies. In the far-infrared, terahertz and microwave regime, metals behaves like a perfect electric conductor (PEC), and hence the natural SPPs cannot be excited on the metal surfaces. The emerging concept of spoof SPPs addresses the challenge of manipulating electromagnetic waves at lower frequencies. Spoof SPPs, or designer SPPs, are sustained by periodically corrugated metal surfaces, which may be one-dimensional groove, two- dimensional holes periodically into a PEC surface, or three-dimensional (3D) periodically corrugated metal wires. They are all 3D structures. In this presentation, we show that the spoof SPPs can be sustained by planar structured metal surfaces in the terahertz frequency, with low propagation loss and bending loss. The proposed structure will be detailed and several terahertz plasmonic metamaterial devices are designed. This new type of plasmonic metamaterial that support spoof SPPs on a plane is a proposing candidate for integrated plasmonic circuits.

Keywords


metamaterials; plasmonics