Abstract
We study the plasmon-assisted transmission of two kinds of slitstructures in a 290-nm-thick silver film on a glass substrate. For thetwo-slit structure, the total transmission intensity spectra displays acomplex modulation, which is attributed to different propagationconstants of the surface plasmon polaritons (SPPs) on the silver-airand silver-glass interfaces. Replacing one of the two slits by ashallow corrugation results in a simple sinusoidal intensity modulationbecause of the only effective SPP excitation and propagation on thesilver-air interface. These confirm the role of different SPPpropagations and interference in the transmission properties of metalnanoslits.
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