J4 ›› 2017, Vol. 34 ›› Issue (1): 123-128.

• 纤维与波导光学 • 上一篇    

基于对称型齿波导和纳米盘的类EIT和慢光效应

谭晓佩,韦中超,梁瑞生,易亚军,张小蒙,钟年发,李先平   

  1. 华南师范大学信息光电子科技学院,广东省微纳光子功能材料与器件重点实验室,广东 广州 510006
  • 收稿日期:2015-11-24 修回日期:2016-04-11 出版日期:2017-01-28 发布日期:2017-01-28
  • 通讯作者: 梁瑞生 (1955-),广东人,教授,博导。从事信息光学及光通信的研究及教学。 E-mail:liangrs@scnu.edu.cn(通信联系人)
  • 作者简介:谭晓佩 (1992-),女,湖南人,研究生,从事表面等离子体波导研究。 E-mail:zz4ztanxiaopei@163.com
  • 基金资助:
    Supported by National Natural Science Foundation of China(国家自然科学基金, 61275059)

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

TAN Xiaopei, WEI Zhongchao, LIANG Ruisheng, YI Yajun, ZHANG Xiaomeng, ZHONG Nianfa, LI Xianping   

  1. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
  • Received:2015-11-24 Revised:2016-04-11 Published:2017-01-28 Online:2017-01-28

摘要: 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。

关键词: 纤维与波导光学;类EIT滤波器;时域有限差分方法;表面等离激元;慢光

Abstract: 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.

Key words: fiber and waveguide optics;electromagnetically induced transparency-like filter; finite-difference time-domain;surface plasmons; slow light

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