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Through analyzing the transmission properties of metallic plates with periodic arrays of subwavelength apertures in different shapes, we found two conditions for such structures to work as super lenses. The working wavelength dictated by the aperture's shape resonance should be much larger than the array's periodicity, meanwhile the coupling between the aperture's waveguide modes and external radiations...
Surface plasmon polaritons (SPPs) are elementary electromagnetic (EM) excitations bounded at a metal/dielectric interface. Due to two important features - local field enhancement and subwavelength resolution capability - of the SPP, it has attracted considerable attention recently and many SPP-based applications were proposed or demonstrated. However, for a natural material, its plasmon frequency...
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