Anomalous amplified and bound-state-like optical transmissions via unidirectional interaction in parity-time symmetric metamaterials

作者：Zhang, Yan-Rong; Wang, Wei; Wang, Lu-Qi; Guo, Rui-Peng; Cao, Xuewei; Chen, Jing^*

来源：Journal of Applied Physics, 2018, 123(10): 103102.

DOI：10.1063/1.5007897

• ELECTROMAGNETICALLY INDUCED TRANSPARENCY
• EXCEPTIONAL POINTS
• METALLIC GRATINGS
• LIGHT
• CONTINUUM
• MODE
• LASERS
• MEDIA

We develop a coupled-mode theory on the optical transmission in parity-time (PT) symmetric coaxial metamaterials. Modeled by coupled lossy Lorentzian oscillators, the theory provides a good fit to numerical full-wave simulation. In the scenario of unidirectional coupling, two polarization-sensitive anomalies are obtained: an amplified transmission and an ultra-narrow one analogous to bound states in continuum. We argue that these phenomena are associated with either a unidirectional-field-transfer process or an indirect unidirectional-field-trapping resonance. The broadening effect is shown to determine the magnitude and polarization of the transmission. Our theory and analysis provide a deep understanding on the importance of PT symmetry and dark helical modes and would contribute to applications such as light storage, field amplification, and even lasing. Published by AIP Publishing.

• 出版日期2018-3-14
• 单位南开大学