Abstract
We propose a novel plasmonic metal structure composed of a silver film perforated with a two-dimensional square array of two-level cylindrical holes on a silica substrate. The transmission properties of this structure are theoretically calculated by the finite-difference time-domain (FDTD) method. Double-enhanced transmission peaks are achieved in the visible and infrared regions, which mainly originate from the excitation of localized surface plasmon resonances (LSPRs), the hybridization of plasmon modes, and the optical cavity mode formed in the holes. The enhanced transmission behaviors can be effectively tailored by changing the geometrical parameters and dielectric materials filled in the holes. These findings indicate that our proposed structure has potential applications in highly integrated optoelectronic devices.
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Abbreviations
- EOT:
-
Enhanced optical transmission
- FDTD:
-
Finite-difference time-domain
- SPPs:
-
Surface plasmon polaritons
- LSPRs:
-
Localized surface plasmon resonances
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 11004088 and 11264017), Scientific and Technological Projects of Jiangxi Provincial Education Department (Nos. GJJ13234, GJJ14253 and GJJ13210), and Natural Science Foundation of Jiangxi Province (Nos. 20122BAB202006, 20112BBE50033 and 20133ACE50006).
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Zhang, X., Liu, G., Hu, Y. et al. Tunable Extraordinary Optical Transmission in a Metal Film Perforated with Two-Level Subwavelength Cylindrical Holes. Plasmonics 9, 1149–1153 (2014). https://doi.org/10.1007/s11468-014-9725-0
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DOI: https://doi.org/10.1007/s11468-014-9725-0