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Reduction of Refractive Index Contrast Threshold for Photonic Band-Gap in Square Lattices |
| WANG Jian-Feng;HUANG Yi-Dong;ZHANG Wei;PENG Jiang-De |
| Department of Electronics Engineering, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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WANG Jian-Feng, HUANG Yi-Dong, ZHANG Wei et al 2005 Chin. Phys. Lett. 22 3094-3096 |
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Abstract The threshold of refractive index contrast (RIC) to open a photonic band gap can be reduced by symmetry breaking. For the case of square lattice composed by dielectric cylinders, the absolute band gap is demonstrated by inserting small rods in the centre of the lattices, and the threshold RIC is reduced to 3.8. As for the square lattices composed by air holes in dielectric, the minimal RIC required for an absolute band gap decreases to 2.20.
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| Keywords:
42.70.Qs
78.20.Bh
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Published: 01 December 2005
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| PACS: |
42.70.Qs
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(Photonic bandgap materials)
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78.20.Bh
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(Theory, models, and numerical simulation)
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