电磁感应透明
诺共振
太赫兹辐射
慢光
窄带
光学
硅
共振(粒子物理)
超材料
光电子学
Q系数
物理
薄脆饼
偶极子
折射率
波长
材料科学
带宽(计算)
谐振器
光子晶体
原子物理学
等离子体子
电信
量子力学
计算机科学
作者
Zihao Wang,Lingling Chen,Xiangjun Li,Tingting Lang,Xufeng Jing,Zhi Hong
摘要
Achieving an ultra-narrow bandwidth analogue of electromagnetically induced transparency (EIT) in bright–bright mode coupling metasurface requires a large contrast of the Q factor and small wavelength detuning between the two coupled modes. Here, by coupling a toroidal dipole (TD) high-Q Fano resonance and a low-Q magnetic dipole (MD) mode, we numerically demonstrated a high Q factor analogue of EIT on an all-silicon metasurface in the terahertz regime. The Q factor of Fano resonance and consequent EIT can be easily adjusted by the spacing between the air holes. By adjusting the radii of the air holes, the thickness of the silicon wafer, or the lattice constant of the metasurface, EIT-like response exhibiting a very high group refractive index and a large group delay was achieved. The proposed EIT metasurface is easy to fabricate and has potential applications in the fields of narrowband filtering and slow-light based devices.
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