Ultraslow-light effects in symmetric and asymmetric waveguide structures with moon-like scatterers

Ultraslow-light effects in two-dimensional hexagonal-lattice coupled waveguide with moon-like scat- terers were theoretically studied using the plane-wave expansion method. For symmetric structures, simulations showed that slow light with high group index can be achieved by shifting the scatterers a...

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Bibliographic Details
Published in:Frontiers of physics 2017-02, Vol.12 (1), p.117-121, Article 124204
Main Authors: Wan, Yong, Ge, Xiao-Hui, Xu, Sheng, Guo, Yue, Yuan, Feng
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Asymmetric structures
Asymmetry
Atomic
Condensed Matter Physics
coupled waveguide
Defects
Light
Light effects
Lunar rotation
Molecular
moon-like scatterer
Optical and Plasma Physics
Particle and Nuclear Physics
photonic crystal
Physics
Physics and Astronomy
Plane waves
Research Article
Simulation
slow light
Symmetry
Waveguides
光效应
六角形
平面波展开法
散射体
月亮
波导结构
耦合波导
非对称结构
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Summary:Ultraslow-light effects in two-dimensional hexagonal-lattice coupled waveguide with moon-like scat- terers were theoretically studied using the plane-wave expansion method. For symmetric structures, simulations showed that slow light with high group index can be achieved by shifting the scatterers and adjusting the radius of moon-like scatterers. The maximum group index was over 8.0 × 10^4. For asymmetric structures, simulations showed that slow light with flat band and high group index can be obtained by shifting the scatterers, adjusting the radius of moon-like scatterers, and rotating the scatterers. The maximum group index was over 5.7 ×10^5 with a ＂saddle-like＂ relationship between the frequency and group index.
ISSN:2095-0462
2095-0470
DOI:10.1007/s11467-016-0598-x