期刊
SUPERLATTICES AND MICROSTRUCTURES
卷 121, 期 -, 页码 45-54出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2018.07.025
关键词
Photonic crystal waveguides; Slow light; Group velocity; Dispersion
资金
- National Natural Science Foundation of China [61275043, 61307048, 60877034, 61605128]
- GDNSF [2017A030310455]
- SZSF [JCYJ20170302151033006]
By separating two photonic crystals with a distance of 2 root 3a, 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 65.70 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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