Different mechanisms for efficient optical transmission through bilayered subwavelength patterned metal films

Details Different mechanisms for efficient optical transmission through bilayered subwavelength patterned metal films Different mechanisms for efficient optical transmission through bilayered subwavelength patterned metal films

2009-03-11

arxiv.org/abs/0903.2075v1

Physics

Optics

4 pages, 2 figures. submitted

Scientific paper

Light transmission through bilayered thin metal films perforated with subwavelength hole arrays are numerically studied based on a full-vector finite-difference time-domain approach. A variety of transmission peaks originating from different physical mechanisms are observed. In addition to the direct tunnelling and Fabry-P\`{e}rot resonances, generally possessed by idealized bilayered dielectric slabs, the near-field localized plasmon polaritons also play important roles. They not only influence the direct tunnelling in a destructive or constructive way, the interactions between these localized plasmon polaritons on different metal films also result in additional channels which transfer optical energy effectively.

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