基于对称型齿波导和纳米盘的类EIT和慢光效应

设计了一种新型的基于金属表面等离子体激元（SPPs）的亚波长金属-绝缘体-金属（MIM）型类电磁诱导透明（EIT）系统，该系统由一个直波导及其两边对称的齿形腔和纳米盘耦合而成。利用耦合模式理论对结构进行分析，并通过时域有限差分方法（FDTD）进行数值模拟。当齿形腔和纳米盘的共振频率相近，可以获得类EIT效应，改变齿形腔的长度和纳米盘的半径可以调节透明窗的位置。该装置可以用作高性能的类EIT滤波器，透过率高达77.5%，半高宽低至35.5 nm，群指数高达65，为高度集成光网络提供了一种新的方法，可应用于波长选择器、超快开关、光存储等设备。

Electromagnetically induced transparency and slow light effect based on symmetric stub waveguides and nanodisks

A novel sub wavelength metal-insulator–metal (MIM) type electromagnetically induced transparency (EIT) system based on metal surface plasmon polaritons(SPPs) is designed. It is composed of a straight waveguide coupled with symmetrical stub cavities and nanodisks. The structure is analyzed by the coupling mode theory and numerical simulation is carried out with the finite-difference time-domain(FDTD) method. When the resonant frequencies of the stub cavities and nanodisks are about the same, EIT-like effect can be obtained. The position of transparent window can be adjusted by changing the stub cavity length and radii of the nanodisks. The device can be used as a high performance EIT-like filter with transmission rate up to 77.5% , full width at half-maximum (FWHM) less than 35.5 nm and group index over 65. The system provides a new method for the highly integrated optical networks. It can be applied to wavelength selector, ultrafast switching, optical storage and other devices.