摘要
An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency （EIT） in the middle-infrared region is reported. The metamaterial consists of two-layered arrays of Ushaped rings embedded in a medium, with the lower layer rotated by 90°. Our simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like positions. The group index reaches about thrice the currently reported maximum value at the high-frequency EIT-like position. The transmittance at the two transparency positions also possesses extremely high Q factors, which is conducive to controlling the propagation of electromagnetic waves.
An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency （EIT） in the middle-infrared region is reported. The metamaterial consists of two-layered arrays of Ushaped rings embedded in a medium, with the lower layer rotated by 90°. Our simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like positions. The group index reaches about thrice the currently reported maximum value at the high-frequency EIT-like position. The transmittance at the two transparency positions also possesses extremely high Q factors, which is conducive to controlling the propagation of electromagnetic waves.
基金
supported by the National Natural Science Foundation of China(No.BK2011203)
the Graduate Innovation Project of Jiangsu Province(No.CXLX110908)
the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions,China
