Abstract
From first-principles computation, we reveal that optical bifacial transmission can be induced within an asymmetric metallic subwavelength structure. This phenomenon can be explained by a concrete picture in which the intensity of the driving forces for surface plasmon or charge wave is asymmetric for the two incident directions. Two distinguished different numerical methods, finite difference time domain (FDTD), and rigorous coupled wave analysis (RCWA) are utilized to verify that optical bifacial transmission can exist for linear plasmonic metamaterial. Previous results are also reviewed to confirm the physical meaning of optical bifacial transmission for a planar linear metamaterial. The incident light can provide direct driving forces for surface plasmon in one direction. While in the opposite direction, forces provided by the light diffraction are quite feeble. With the asymmetric driving forces, the excitation, propagation, and light-charge conversion of surface plasmon give the rise of bifacial charge-oscillation-induced transmission. In periodic a structure, the excitation of surface plasmon polariton can lead to the spoof vanish of such phenomenon. The transmissions for two incident directions get the same in macroscopic while the bifacial still exists in microscale.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 51522601, 51436009), and the program for New Century Excellent Talents in University (No. NCET-13-0173). A very special acknowledgment is made to the editors and referees whose constructive criticism has improved this paper.
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Jia, ZX., Shuai, Y., Zhang, JH. et al. Optical Bifacial Transmission by Asymmetric Charge-Oscillation-Induced Light Transmission Through a Plasmonic Structure. Plasmonics 13, 825–833 (2018). https://doi.org/10.1007/s11468-017-0578-1
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DOI: https://doi.org/10.1007/s11468-017-0578-1