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利用时域有限差分(FDTD)法,对12重准晶光子晶体(PQCs)的绝对带隙特性进行研究。主要讨论了加工过程中产生的尺寸误差和位置误差对12重PQCs绝对带隙的影响,并估算当前加工该带隙材料的能力。数值模拟结果表明,在相同误差条件下,尺寸误差大于位置误差对绝对带隙的影响;12重PQCs绝对带隙特性主要受TE模对加工误差敏感程度的限制;绝对带隙宽度随晶格常数的减小而逐渐变窄,当晶格常数不小于500 nm时,加工误差对绝对带隙的影响可忽略,而当晶格常数小于200 nm时,绝对带隙甚至完全消失。
The absolute bandgap properties of 12-p-quasicrystal photonic crystals (PQCs) were investigated by using the FDTD method. The effects of size error and position error on the absolute band gap of 12-pQCs are mainly discussed, and the current capability of processing this band gap material is estimated. Numerical simulation results show that under the same error conditions, the dimensional error is larger than the position error on the absolute bandgap. The absolute bandgap properties of 12-pQCs are mainly limited by the TE modal sensitivity to processing errors. The absolute band gap width depends on the lattice constant , The effect of processing error on the absolute bandgap is negligible when the lattice constant is not less than 500 nm. When the lattice constant is less than 200 nm, the absolute band gap disappears completely.