Abstract
The shallow mini-band states have been clearly located in experiment in the graded periodic structure which was fabricated by the holography method. We demonstrated that the band edge folding and splitting into individual shallow levels are due to long-periodic modulation. Numerical simulations show strong slow-light effect and low second-order dispersion of mini bands. By taking into account the non-uniform distribution of the material, the numerical results agree quite well with the experimental results. To our knowledge, this is the first instance in which shallow mini-band states have been experimentally located in a graded periodic film via the holography method.
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Acknowledgements
This research is supported by the Chinese National Key Basic Research Special Fund (No 2011CB922003), the National Key Basic Research and Development Program of China under Grant (No 2010CB327605), Chinese Natural Science Foundation (No 11174162), Tianjin Natural Science Foundation (No 09JCYBJC01600), Science and Technology Program of Tianjin (No 10ZCGHHZ01100), and Fundamental Research Funds for the Central Universities (No 65010931).
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Ying, CF., Zhou, WY., Ye, Q. et al. Mini-band states in graded periodic 1D photonic superstructure. Appl. Phys. B 107, 369–374 (2012). https://doi.org/10.1007/s00340-012-4940-x
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DOI: https://doi.org/10.1007/s00340-012-4940-x