Plasmonic metamaterial with fishnet superlattice for enhanced chemical sensing

In this work we consider a novel type of superlattice fishnet metamaterial for chemical sensing. By superimposing two fishnet metamaterial lattices we aim to achieve increased functionality compared to the standard fishnet metamaterials. We investigate spectral response of our structure to the changes in surrounding medium to be utilized in single wavelength readout chemical sensing. Additionally we compare the dispersion relation of plasmon modes in our superlattice fishnet metamaterial to the single lattice metamaterial and analyze the nature of coupling between plasmon modes. We present possibilities for multispectral sensing operation as well as for switching the resonant plasmon modes between sublattices by purely optical means.