Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7938431 | Superlattices and Microstructures | 2018 | 17 Pages |
Abstract
By separating two photonic crystals with a distance of 23a, where a is the lattice constant, shifting the positions of some discriminatory air holes in the upper and lower edges, and inserting a defect central row, a specific waveguide is set up, W3 photonic crystal waveguide (W3 PCW). An equivalent transmission line model is given, giving the theoretical basis of for the proposed waveguide to have a wider transmission bandwidth and thus higher normalized delay bandwidth product (NDBP). Slow-light properties and performance are studied by using plane-wave expansion and finite-difference time-domain methods. We obtained ultra-wideband of 65.70â¯nm with low group-velocity dispersion and at the same time a high NDBP of 0.496 through optimization which is a worthy indicator for slow light device performance. Wider bandwidth can allow shorter duration of pulse waves, causing higher field intensity and stronger nonlinear effect.
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Materials Science
Electronic, Optical and Magnetic Materials
Authors
Sayed Elshahat, Israa Abood, Karim Khan, Ashish Yadav, Qiong Wang, Qiang Liu, Mi Lin, Keyu Tao, Zhengbiao Ouyang,