Gain-assisted plasmon induced transparency in T-shaped metamaterials for slow light. (9th April 2015)

• Record Type: Journal Article
• Authors: He, Jinna; Wang, Junqiao; Ding, Pei; Fan, Chunzhen; Liang, Erjun
• Is Part Of: Journal of optics. Volume 17:Number 5(2015:May)
• Publication Date: 2015-04-09
• Subjects: plasmon induced transparency -- gain amplification -- slow light; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/17/5/055002
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: We theoretically investigate the gain-assisted plasmonic analog of electromagnetically induced transparency (EIT) in a novel planar metamaterial, whose unit cell consists of two perpendicularly connected metallic bars, forming a 'T' configuration. An EIT-like resonance can be achieved by introducing symmetry breaking into its shape. The results show that the group index is greatly enhanced at the optimum value of the gain due to a dramatic amplification of the EIT-like resonance. Furthermore, a trade-off between the group index and the transmittance at the EIT-like resonance, which always exists in passive systems with no gains, can be removed at an approximate gain level. E-field enhancements are used to understand the underlying physics.