Numerical and theoretical modeling demonstrates tunable fast- and slow-light effects in concentric nanoring plasmonic waveguides, indicating potential for ultra-compact integrated optical devices.
In this letter, the metal-insulator-metal plasmonic waveguides shoulder-coupled two concentric nanorings are investigated both numerically and theoretically. Based on the three-level system, the extreme destructive interference between bright and dark resonators gives rise to the distinct plasmonically induced absorption response with the abnormal dispersion and novel fast-light feature. By the same principle, the dramatic plasmonically induced transparency effect with slow-light characteristic is obtained in the waveguide-resonator system with side-coupling configuration. All simulated results are confirmed by the coupled mode theory. Proposed structures will open a new avenue for controlling the speed of a light signal in ultra-compact integrated devices.
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Li et al. (2016) studied this question.
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