摘要
Thebandstructuresofflexuralwavesinaphononiccrystalthinplatewithstraight,bendingorbranchinglineardefectsaretheoreticallyinvestigatedusingthesupercelltechniquebasedontheimprovedplanewaveexpansionmethod.Weshowtheexistenceofanabsolutebandgapoftheperfectphononiccrystalandlineardefectmodesinsidethegapcausedbylocalizationofflexuralwavesatornearthedefects.Thedisplacementdistributionsshowthatflexuralwavescantransmitwellalongthestraightlineardefectcreatedbyremovingonerowofcylindersfromtheperfectphononiccrystalsforalmostallthefrequenciesfallinginthebandgap,whichindicatesthatthisstructurecanactasahighefficiencywaveguide.However,forbendingorbranchinglineardefects,thereexistbothguidedandlocalizedmodes,andthereforethephononiccrystalscouldbeservedaswaveguidesorfilters.
出版日期
2010年10月20日（中国期刊网平台首次上网日期，不代表论文的发表时间）
