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The optimal operating parameters for LRSPP excitation by evanescent wave coupling when n0 = 1.52, n1 = 1.34, n2 = 0.18344 + 3.4332i and n3 = 1.34 for different thicknesses of gold d2 ranging from 20 to 75 nm. The blue curve shows the cavity thickness d1 where the lowest intensity dip occurs. The red curve showed the n0sinθ0 positions where the LRSPP excited.
