Abstract
The optical properties of the Au/Al2O3/Ag plasmonic metawaveguide with two-dimensional periodic stub resonators were numerically investigated. The modes of this design can be characterized by the waveguide mode and stub resonance. The guided modes, which propagate inside the Al2O3 layer, can be modulated by interacting with the stub resonators. In this situation, the negative group velocity dispersion relations in the near-infrared region can be realized. Focusing characteristics of this design were investigated by changing the design of the unit cell and the dispersion characteristics were discussed. In addition, the simplified design of the stub resonators was proposed. It was suggested that the proposed structure has the property to function as a nanotransmission line structure, which shows negative refraction at near infrared.
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