An analog of double electromagnetically induced transparency with extremely high group indexes

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（5）
• 页码范围: 46-48
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201311.051602

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.