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Slow light in a slot photonic crystal waveguide with asymmetric dielectric rods
Author(s): Jing Shu; Shuzhen Dang
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Paper Abstract

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.

Paper Details

Date Published: 24 January 2019
PDF: 9 pages
Proc. SPIE 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 108400S (24 January 2019); doi: 10.1117/12.2514782
Show Author Affiliations
Jing Shu, Nanjing Univ. of Science and Technology (China)
Shuzhen Dang, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10840:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics
Mingbo Pu; Xiong Li; Bin Fan; Min Gu; Reinhart Poprawe; Xiangang Luo, Editor(s)

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