Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 95, Issue 1, Pages 105-111Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-009-3412-4
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Funding
- National Natural Science Foundation of China [60377023, 60672017]
- New Century Excellent Talents in University (NCET) Shanghai Optical Science and Technology [05DZ22009]
- Shanghai Pujiang Program.
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In this paper, we propose the use of two two-dimensional photonic crystal line defect waveguides for slow light with large delay-bandwidth product (DBP). One includes air rings localized at each side of the line defect and the other modifies the radius and distance of holes at each side of the waveguide. We show that we can achieve a very flat band corresponding to nearly constant group index over a broad frequency range by adjusting the parameters of the structure. We show further that the group velocity dispersion (GVD) can reach a relatively small amount and the DBP can be more than 0.6 for the first waveguide and 0.34 for the second waveguide. Numerical simulation by the finite-difference time-domain (FDTD) method demonstrates the propagation of the broadband pulse.
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