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Anomalous transmission of terahertz wave through one-dimensional lamellar metallic grating |
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| Authors: | Dong Li Shiwei Shu Fangfang Li Guohong Ma Ye Dai Hongliang Ma |
| Institution: | 1. College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China;2. Shenzhen Key Laboratory of Laser Engineering, Shenzhen University, Shenzhen 518060, China;3. Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen University, Shenzhen 518060, China |
| Abstract: | The anomalous transmission through one-dimensional lamellar metallic gratings was investigated in terahertz (THz) regime. The extraordinary optical transmission (EOT) is identified to originate from two possible ways: coupling of incident light with waveguide resonances and coupling of surface plasmon polaritons (SPPs) at the upper and lower interfaces of metal grating. The dual effects of SPPs have been clarified in this study: (i) the excitation of SPP modes at each individual interface results in the weakness of the THz wave transmission; and (ii) the coupling of SPP modes at two interfaces of metal grating is attributed to enhancement of THz wave transmission. The enhanced transmission is dominated by the coupling of incident light with transverse waveguide resonances. Numerical simulation based on finite-difference time-domain (FDTD) agrees well with experimental results. |
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