Ms. Shuzhen Dang Profile

Shuzhen Dang

at Nanjing University of Science and Technology

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Proceedings Article | 24 January 2019 Paper

Slow light in a slot photonic crystal waveguide with asymmetric dielectric rods

Jing Shu, Shuzhen Dang

Proceedings Volume 10840, 108400S (2019) https://doi.org/10.1117/12.2514782

KEYWORDS: Slow light, Photonic crystals, Dispersion, Waveguides, Dielectrics, Refractive index

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A novel air slot photonic crystal slow light waveguide structure is proposed. The symmetry of the waveguide is broken by shifting the dielectric rods asymmetrically along the slot axis. When the photonic crystal lattice vector angle is greater than 60 degrees, it can make the performance of slow light more excellent. A triangular lattice photonic crystal with the lattice vector 90 degrees is obtained by rotating the cubic lattice 45 degrees counterclockwise. Five optimized structures are obtained by optimizing the width of the slot, the radius of the two rows of semicircular dielectric columns in the upper and lower air slots as well as the asymmetric movement of the two rows of dielectric rods near the slot. The dispersion curves of the guided mode, the corresponding group index and group velocity dispersion are analyzed using the plane wave expansion method. Finally, considering a criterion of restricting the group index variation within ±10% range and higher normalized delay bandwidth product, the best group refractive index is 272 with the corresponding normalized delay bandwidth product is 0.3009. The numerical results provide theoretical foundation for potential applications of optical buffer in photonic crystals field.

Proceedings Article | 28 February 2017 Paper

Study and analysis on slow light in photonic crystal waveguide

Shuzhen Dang, Jing Shu

Proceedings Volume 10256, 102565X (2017) https://doi.org/10.1117/12.2256218

KEYWORDS: Slow light, Waveguides, Photonic crystals, Dispersion, Dielectrics, Refractive index, Light wave propagation, Optical networks, Geometrical optics

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Slow light is to reduce the light propagation speed in the medium. In recent years, because slow light technology is the key to achieving all-optical network technologies constitute optics, it attracted people's attention. Compared with other methods, photonic crystal waveguides provide slow light with many adventages, especially we can fine tune the structure to control the performance of the slow-light. Because the two-dimensional triangular lattice photonic crystal is easier to form band gaps than two-dimensional cubic lattice photonic crystal, the circular dielectric rod is easier to form band gaps than square dielectric cylinder, when the photonic crystal lattice vector angle is greater than 60 degrees, it can make the performance of slow light more excellent. So in this paper,we will rotate the cubic lattice 45 degrees counterclockwise. By reducing the radius of middle row of medium column to form the line defect; Additionly, we design a coupled cavity waveguide. Using the plane wave expansion method (PWE), we have analyzed the dispersion curves of the guided mode, the corresponding group refractive index and group velocity dispersion of slow light. For the line defected waveguide, we have realized the group refractive index changing from 8.1 to 84.8 by fine tuning the radius of the defective rod, the position and radius of the first row of the dielectric cylinder close to the waveguide. For the coupled cavity waveguide, we have realized the group refractive index changing from 16 to 79 by fine tuning the radius of the defective rod.

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