Abstract
We reported an analog of electromagnetically induced transparency (A-EIT) featured by double transparent peaks in the spectrum. The A-EIT is realized by double-layered metasurface which consists of spoof localized surface plasmons (S-LSP) and cut-wire (CW)-square rings (SR) hybrid. Electric and magnetic S-LSP are excited as bright and dark modes respectively then couple with resonant modes of CW and SR simultaneously to achieve multiple A-EIT. Two bright modes of the electric S-LSP and SR are excited by external electric field directly that produce a bright-bright mode A-EIT. Moreover, the magnetic S-LSP, which cannot be excited by external field directly, is excited through near field coupling from CW, inducing another bright-dark mode A-EIT. Theoretical analysis with corresponding experiment in microwave band are introduced for better insights into physical essence of the double-peaks A-EIT.
Highlights
We reported an analog of electromagnetically induced transparency (A-EIT) featured by double transparent peaks in the spectrum
Compared to the enlightened pioneering work realizing one transparent peak based on magnetic resonances[32], we propose a novel A-EIT featured by double transparent peaks based on a bright-dark mode between CW and magnetic spoof localized surface plasmons (S-LSP) and a bright-bright mode between electric S-LSP and square rings (SR)
Due to the proposed A-EIT need to the S-LSP exciting, it can be considered as plasmon induced transparency (PIT)
Summary
We reported an analog of electromagnetically induced transparency (A-EIT) featured by double transparent peaks in the spectrum. Coupling between the modes with almost the same resonant frequency is the necessary condition to obtain classical EIT in metamaterials. The excited electric S-LSP and magnetic S-LSP from spiral metasurface structure are simultaneously regarded as coupling modes for A-EIT realizing.
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