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A subwavelength slit with metal–dielectric–metal (MDM) composite surface gratings is proposed and numerically investigated using finite-difference time-domain (FDTD) method. Compared with conventional monometal-grating based structures, focusing properties of the proposed MDM structure can be enhanced based on multiple scattering and coupling of surface plasmon polaritons (SPPs) along the metal/dielectric...
Extraordinary optical behaviours can be observed due to the light interaction with subwavelength metallic structures, which shows prospective applications in many optics fields, like nano optical elements, lithography, radar, microscope imaging and biosensing etc. In this paper, we present our investigations on this subject with propagation modulation in metallic slits with variant width, light propagation...
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