Formation mechanism and modulation of electromagnetically induced transparency-like transmission in side-coupled structures
来源期刊：中南大学学报(英文版)2015年第6期
论文作者：YANG Hui LI Hong-jian XU Xiu-ke HE Zhi-hui WANG Yun XU Guo-jun
文章页码：2020 - 2026
Key words：metal-insulator-metal (MIM) waveguide; side-coupled resonator; electromagnetically induced transpareucy (EIT)-like transmission; formation mechanism
Abstract: Based on Fabry model and finite-different time-domain (FDTD) method, the plasmonic structure composed of a metal-insulator-metal (MIM) bus waveguide and a side-coupled resonator was investigated. It is found that the transmission features can be regulated by the cavity width and coupling distance. Electromagnetically induced transparency (EIT)-like transmission can be excited by adding an identical resonator on the pre-existing structure. Combining the foregoing theoretical analysis with coupled mode theory (CMT), the formation process of the EIT-like transmission was detailedly analyzed. EIT-like transmission can also be excited in plasmonic structure with two detuned resonators. By altering the structure parameters, the transparency window can be purposefully modulated. With the merits of compact structure and simplicity in fabrication, the proposed structures may have a broad prospect of applications in highly integrated optical circuits.
YANG Hui(杨辉)1, LI Hong-jian(李宏建)1, 2, XU Xiu-ke(许秀科)1, HE Zhi-hui(何智慧)1, WANG Yun(王云)1, XU Guo-jun(徐国均)1
(1. School of Physics and Electronics, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:Based on Fabry model and finite-different time-domain (FDTD) method, the plasmonic structure composed of a metal-insulator-metal (MIM) bus waveguide and a side-coupled resonator was investigated. It is found that the transmission features can be regulated by the cavity width and coupling distance. Electromagnetically induced transparency (EIT)-like transmission can be excited by adding an identical resonator on the pre-existing structure. Combining the foregoing theoretical analysis with coupled mode theory (CMT), the formation process of the EIT-like transmission was detailedly analyzed. EIT-like transmission can also be excited in plasmonic structure with two detuned resonators. By altering the structure parameters, the transparency window can be purposefully modulated. With the merits of compact structure and simplicity in fabrication, the proposed structures may have a broad prospect of applications in highly integrated optical circuits.
Key words:metal-insulator-metal (MIM) waveguide; side-coupled resonator; electromagnetically induced transpareucy (EIT)-like transmission; formation mechanism
