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Enhanced Focusing Properties Using Surface Plasmon Multilayer Gratings

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7 Author(s)
Hui Li$^{1}$Center for Information Photonics and Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China ; Lianshan Yan ; Zhen Guo ; Wei Pan
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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 multilayer films, especially the focal length can be varied from ~ 2.6 to 5.82 μm by adjusting the dielectric thickness.

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IEEE Photonics Journal  (Volume:4 ,  Issue: 1 )