Lai Gen, Liang Ruisheng, Zhang Yujing, Bian Zhenyu, Yi Lixuan, Zhan Guangzhi, Zhao Ruitong
Opt Express. 2015 Mar 9;23(5):6554-61. doi: 10.1364/OE.23.006554.
An analog of plasmonic system for electromagnetically induced transparency (EIT), in which a small nanodisk with a big side-coupled-nanodisk is directly coupled to the metal-insulator -metal (MIM) waveguide, has been proposed and investigated theoretically and numerically. When the resonant frequencies of the two nanodisks differ not too much, a powerful EIT-like effect can be obtained, and the transparency window can be easily tuned by adjusting the radii of the two nanodisks. The plasmonic device can be used as a high-performance EIT-like filter with transmission over 80% and full width at half-maximum (FWHM) less than 30nm, besides, the novel structure shows a high group index over 355. The system paves a new way toward highly integrated optical circuits and networks, especially for wavelength-selective, ultrafast switching, light storage and nonlinear devices.
一种用于电磁诱导透明（EIT）的表面等离激元系统的类似物已被提出，并进行了理论和数值研究。在该系统中，一个带有大的侧面耦合纳米盘的小纳米盘直接耦合到金属 - 绝缘体 - 金属（MIM）波导上。当两个纳米盘的共振频率相差不太大时，可以获得强大的类EIT效应，并且通过调整两个纳米盘的半径可以轻松调节透明窗口。该表面等离激元器件可用作高性能类EIT滤波器，其透射率超过80%，半高宽（FWHM）小于30nm，此外，这种新颖的结构显示出超过355的高群折射率。该系统为高度集成的光学电路和网络，特别是波长选择、超快开关、光存储和非线性器件，开辟了一条新途径。
