Multiband polaritonic filter made of piezoelectric superlattices

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• 作者：Zhenxing Liu and Weiyi Zhang
• 关键词：Polariton ; Defect ; Piezoelectric
• 刊名：Physics Letters A
• 出版年：2006
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：27 February 2006
• 卷：351
• 期：3
• 页码：192-197
• 文件大小：299 K

摘要

The polaritonic band structures and transmission spectra of piezoelectric-modulated superlattices are investigated for a variety of supercell configurations. In the absence of a defect layer a polaritonic-like band gap exists and relative band gap can reach as large as 19%for superlattices made of LiNbO₃. In the presence of a defect layer, the positions and number of defect modes can be controlled directly by the number of domains in a supercell, the widths of defect modes are determined by layer thickness difference between defect domain and the periodic domain. Such uniformly distributed in-gap modes make them ideal candidates for the potential multiband filters.