Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9785945 | Optics Communications | 2005 | 7 Pages |
Abstract
The propagation losses in single-line defect waveguides in a two-dimensional (2D) square-lattice photonic crystal (PC) consisted of infinite dielectric rods and a triangular-lattice photonic crystal slab with air holes are studied by finite-difference time-domain (FDTD) technique and a Padé approximation. The decaying constant β of the fundamental guided mode is calculated from the mode frequency, the quality factor (Q-factor) and the group velocity vg as β = Ï/(2Qvg). In the 2D square-lattice photonic crystal waveguide (PCW), the decaying rate ranged from 103 to 10â4 cmâ1 can be reliably obtained from 8 Ã 103-item FDTD output with the FDTD computing time of 0.386 ps. And at most 1 ps is required for the mode with the Q-factor of 4 Ã 1011 and the decaying rate of 10â7 cmâ1. In the triangular-lattice photonic crystal slab, a 104-item FDTD output is required to obtain a reliable spectrum with the Q-factor of 2.5 Ã 108 and the decaying rate of 0.05 cmâ1.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Qin Chen, Yong-Zhen Huang, Wei-Hua Guo, Li-Juan Yu,