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【摘 要】
：
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 die
【机 构】
：
Department of Electronics Engineering, Tsinghua University, Beijing 100084
【出 处】
：
中国物理快报（英文版）
【发表日期】
：
2005年12期
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