Simultaneous Enhancement of Bandwidth and Group Index of Slow Light via Metamaterial Induced Transparency With Double Bright Resonators

• Published in: IEEE journal of selected topics in quantum electronics Vol. 21; no. 4; pp. 295 - 300
• Main Authors: Cong, Jiawei, Zheng, Gaige, Yun, Binfeng, Zhou, Zhiqiang
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bandwidth; Couplings; Dispersions; Indexes; Joining; Mathematical analysis; Metamaterials; Optical resonators; Oscillators; Resonant frequency; Resonators; Slow light; Strategy; double bright resonators; metamaterial induced transparency; Broadband; slow light; group index
• ISSN: 1077-260X; 1558-4542
• DOI: 10.1109/JSTQE.2014.2354639

We propose a design strategy to alleviate the tradeoff between the wide frequency band and large group index of metamaterial induced slow light. It is realized with a structure consisting of double bright resonators and a single dark resonator in each unit cell. Such a structure enables the slow light with enhanced bandwidth and increased group index simultaneously than the conventional scheme with only one bright resonator. The origin is attributed to the stronger bright-dark coupling and steeper dispersion in the double bright structure. The slow light characteristics are analytically demonstrated with the coupled oscillator model and verified by the full-wave simulations. The presented design rule may offer an avenue to realize broadband slow light devices.