Abstract
Terahertz transmission spectra through both single-layered and double-layered sub-wavelength metal hole arrays were calculated using rigorous mode-matching method. The dispersion relations of the single-layered and double-layered metal hole arrays were obtained by FDTD method. There are three anomalous peaks in the spectrum of the double-layered metal hole array, which arise from the three surface electromagnetic modes appearing in the dispersion relation. By comparing the transmission spectra and the dispersion relations of the single-layered and double-layered metal hole arrays, it was found that the two surface electromagnetic modes at higher frequencies are introduced by the single-layered metal hole array, while the one at lower frequencies is introduced by the double-layered metal hole array. The validity of the analysis was qualitatively verified by the experimental results. This structure can be finely designed for potential applications, such as wideband filtering.
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RAO Lei was born in 1985. She received the BS in electronic science and technology from Zhejiang University, Hangzhou, in 2007. Currently, she is a Ph.D. student at Zhejiang University. Her research interests include terahertz functional components, metal SPPs and photonic crystal.
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Rao, L., Yang, D. Surface electromagnetic modes contribution to the anomalous terahertz transmission through double-layered metal hole array. Sci. China Inf. Sci. 55, 90–97 (2012). https://doi.org/10.1007/s11432-011-4517-z
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DOI: https://doi.org/10.1007/s11432-011-4517-z