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By applying a scattering-wave theory, the electromagnetic response of anarbitrary array of multiple slits perforated on a metallic film and filled withdifferent slit dielectric materials can be studied in an analytical way. Here,the wavelength-dependent splitting of a light beam into two by asymmetricallyfilled slits in a metal film using intra- and inter-slit dual-waveinterferences is fully explored. We consider a triple-slit structure perforatedon a gold film, where the middle slit is used for the surface-plasmonexcitation by a narrow Gaussian beam while the two side slits are used for thedetection of a transmitted surface-plasmon wave propagated from the middleopaque slit either at a particular wavelength or at double that wavelength,respectively. For this proposed simple structure, we show that only one of thetwo side observation slits can be in a passing state for a particularwavelength, but the other blocked slit will change to a passing state at doublethat wavelength with a specific design for the slit depth, slit dielectric, andinter-slit distance in the deep sub-wavelength regime. In this sense,surface-plasmon mediated light transmission becomes wavelength sensitive in ourmodel, and a single light beam can be separated into two according to itswavelength in the transverse direction parallel to the array. This provides uswith a unique way for direct optical reading in the near-field region using anon-spectroscopic approach.

Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength