Larger Two-Dimensional Photonic Band Gaps.
Larger Two-Dimensional Photonic Band Gaps.
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DOI：
10.1103/physrevlett.77.2949
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发表时间：
1996-09
影响因子：
8.6
通讯作者：
C. M. Anderson;K. Giapis
中科院分区：
文献类型：
--
作者：
C. M. Anderson;K. Giapis
在二维正方形和蜂窝形圆截面杆晶格中，通过降低结构对称性可以提高光子晶体的绝对带隙。将较小直径的棒添加到每个晶格晶胞的中心中提升带简并以产生显著更大的带隙。对称性破缺在填充分数附近是最有效的，这些分数产生原始晶格的绝对带隙。棒直径比在0.1-0.2的范围内产生绝对间隙尺寸的最大改善。晶体对称性约化为光子带隙的工程设计开辟了新的途径。
Absolute photonic band gaps in two-dimensional square and honeycomb lattices of circular cross-section rods can be increased by reducing the structure symmetry. The addition of a smaller diameter rod into the center of each lattice unit cell lifts band degeneracies to create significantly larger band gaps. Symmetry breaking is most effective at filling fractions near those which produce absolute band gaps for the original lattice. Rod diameter ratios in the range 0.1–0.2 yield the greatest improvement in absolute gap size. Crystal symmetry reduction opens up new ways for engineering photonic gaps.