Abstract
We illustrate the mechanism of multispectral Fano-like phenomenon in a double layer coupled plasmonic system and investigate its tunability by changing the geometrical parameters. By tuning the parameters in the double layer system, we show that the height of the dielectric layer between two layers plays an important role in the transmission spectrum for the studied range. The application of the double layer coupled plasmonic system in displacement sensing is also demonstrated by moving the bottom layer leftward and forward with respect to the top layer. The frequency of the spectrum peak is shown to be a linear function of forward displacement up to 2 nm. The simulations demonstrate that the small displacement can lead to frequency shift and amplitude change of the transmission peak.
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