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

Abstract

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

CLC Number:

O436

TAN Xiaopei, WEI Zhongchao, LIANG Ruisheng, YI Yajun, ZHANG Xiaomeng, ZHONG Nianfa, LI Xianping. Electromagnetically induced transparency and slow light effects based on symmetric stub waveguides and nanodisks [J]. J4, 2017, 34(1): 123-128.

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