Resonant Effects of FPL and SPP for Light Transmitting through Subwavelength Metallic Gratings |
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| Authors: | MA You-Qiao ZHOU Jun HE Miao L Petti P Mormile |
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| Institution: | 1.Department of Physics, Faculty of Science, Ningbo University, Ningbo 315211, China;2.Photonics Research Centre, School of Electronic and Communications Engineering, Dublin Institute of Technology, Dublin 8, Ireland;3.Institute of Optoelectronic Materials & Technology, South China Normal University, Guangzhou 510631, China;4.Institute of Cybernetics of CNR, Via Campi Flegrei 34, 80072-Pozzuoli, Italy |
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| Abstract: | A new model is proposed to explain the physical mechanism of the extraordinary transmission enhancement in subwavelength metallic grating. The extraordinary transmission enhancement is described by the co-operation of Fabry-Perot-like (FPL) resonance and the surface plasmon polariton (SPP) resonance. The rigorous coupled-wave analysis (RCWA) and the finite difference time domain (FDTD) method are employed to illustrate the model by calculating the transmission and the field distributions in the subwavelength metallic grating, respectively. And the numerical calculations show that transmission enhancement is achieved when the coupling resonance of the incident light, the surface plasmon polariton mode and the Fabry-Perot-Like mode is happened, which are in good agreement with the proposed model. |
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| Keywords: | gratings subwavelength structures optics at surfaces surface plasmons |
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