科研之友
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摘要
A left-handed material, a metal waveguide with arrays of metal rods within it, is investigated in this letter. The simulation results have shown that the refractive indices are negative between 512 and 898 nm, while the negative-index band with high transmission ranges roughly from 672 to 798 nm. This is an effective method to the realization of negative refraction at visible frequencies. The mechanism of resonance has been revealed by simulating the distributions of induced current in a unit cell. A wedge-shaped structure has also been designed to provide direct evidence for the negative refraction behavior.
