Convert from Fano resonance to electromagnetically induced transparency effect using anti-symmetric H-typed metamaterial
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Convert from Fano resonance to electromagnetically induced transparency effect using anti‑symmetric H‑typed metamaterial resonator Yuanhao He1 · Ben‑Xin Wang1 · Pengcheng Lou1 · Nianxi Xu2 · Xiaoyi Wang2 · Yanchao Wang2 · Jianjun Cao1 Received: 22 April 2020 / Accepted: 13 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This paper describes a simple H-typed terahertz metamaterial structure consisting of three metal rectangular strips. The structure can convert the Fano effect to the electromagnetically induced transparency (we use its abbreviation EIT instead) effect in the frequency range of 0.1–1.5 THz. The results show that the Fano effect occurs when the symmetry of the H-typed structure is slightly broken, and a narrow and sharp Fano dip occurs at a frequency of 1.05 THz, and the Q value of the Fano dip can reach 43. When the structural asymmetry is increased by moving the metal rectangular strip in the middle, the structure realizes a transition from the Fano effect to the EIT effect, and a transparent transmission with a line width of 0.383 THz occurs at a frequency of 1.0 THz, and the transmittance is as high as 93.66%. In order to illustrate the mechanism of the Fano effect and the EIT effect in this structure, we present the electric fields at several key resonant frequencies and discuss and analyze them. In addition, we also study the effects of structural parameters on the Fano effect and the EIT effect, and make appropriate discussions and summaries. This metamaterial structure enables the functional conversion from Fano to EIT, and the functional conversion device designed by this has potential application value in terahertz sensing technology. Keywords Metamaterial · Fano resonance · Electromagnetically induced transparency · Terahertz
* Ben‑Xin Wang [email protected] 1
School of Science, Jiangnan University, Wuxi 214122, China
2
Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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1 Introduction Metamaterials are a class of artificial composites materials with special optical properties that are not found in nature. People can use them to achieve special functions that traditional materials cannot achieve, such as negative refraction (Ling et al. 2018), perfect lensing (Rosenblatt and Orenstein 2017), cloaking (Islam et al. 2018), negative compressibility (Nicolaou and Motter 2016) and super focusing (Boardman et al. 2012). Metamaterials are usually composed of periodic structures whose odd properties are derived from their precise geometry and size. The structural unit size of a metamaterial is generally much smaller than the working wavelength. When an electromagnetic wave is incident, each structural unit is equivalent to an artificial atom. By designing the structural unit, any equivalent dielectric constant and magnetic permeability desired can be ob
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