Optical transmission through metal/dielectric multilayer films perforated with periodic subwavelength slits |
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| Authors: | Dong Xiang Ling-Ling Wang Xiang Zhai An-Lian Pan |
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| Institution: | a Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Microelectronics Science, Hunan University, Changsha 410082, Chinab School of Nuclear Science and Technology, University of South China, Hengyang 421001, China |
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| Abstract: | The transmission of p-polarized plane wave through Ag/SiO2 multilayer films perforated with periodic subwavelength air slits is investigated by using the finite-difference time-domain (FDTD) method. The results show that the optical transmission property is mediated by the interference among the propagating coupled-SPP modes along the lateral direction inside the SiO2 layers and the conditions of Fabry-Pérot-like resonance along the longitudinal direction together. When some geometric parameters are suitably initialized, the high transmission peaks can split into more peaks as the functional layer (metal/dielectric/metal sandwich stack) number increases, and the wavelength of the same-order transmission peak exhibits a red shift as the grating period increases. |
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| Keywords: | Subwavelength slits Multilayer films Extraordinary optical transmission Surface plasmon polaritons |
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