纳米氧化锌中回音壁模发光特性的形貌依赖-论文.pdf

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1、第34卷光学学报光学前沿——信息光学2014年9月ACTAOPTICASINICA专刊纳米氧化锌中回音壁模发光特性的形貌依赖王马华朱光平朱汉清付丽辉居勇峰／淮阴工学院电子与电气工程学院，江苏淮安223002、＼淮北师范大学物理与电子信息学院，安徽淮北235000／摘要基于气相传输法制备纳米管、纳米棒和纳米帽等具有六方对称截面的不同形貌纳米氧化锌样品．应用扫描电镜、x射线衍射谱和高分辨率透射电镜进行结构表征后，室温下以中心波长355、800、1150nm纳秒脉冲激光激发，研究径向尺寸和纵向形貌对样品回音壁模光致辐射特性的影

2、响．实验发现纵向结构均匀、径向尺寸相近的纳米管与纳米棒具有相近的辐射特性；随着径向尺寸增加，受激辐射有明显的低阈值化趋势。与上述棒状、管状结构相比较，较细纵杆支撑较大顶部的帽状结构样品中在其顶部易获得更低阈值回音壁模单光子受激辐射、双光子和三光子吸收的上转换辐射。仿真研究与理论分析表明，腔内光场局域性、横向场与纵向模耦合损耗是样品发光特性形貌依赖的主要物理机制。关键词材料；氧化锌；回音壁模；模式耦合损耗；射线跟踪法；时域有限差分法中图分类号0432；0738文献标识码Adoi：10．3788／A0S2O1434．sl16

3、001Morphology．DependentWGMsPhotoluminescenceCharacteristicsfromMicro／Nano．StructuralZnOSamplesWangMahuaZhuGuangpingZhuHanqingFuLihuiJuYongfeng／FacultyofElectronicandElectricalEngineering，HuaiyinInstrituteofTechnology，Huaian，Jiangsu223002，China、＼SchoolofPhysicsand

4、ElectronicInformation，HuaibeiNormalUniversity，Huaibei，Anhui235000，ina／AbstractZnOsampleswithhexagona1cross—section，differentradia1sizesand1ongitudinalprofiles，suchasnanorods，nanotubesandcap．1ikeones，arepreparedbythevaporphasetransportmethod．Afterthesamplesareexam

5、inedbyscanningelectronmicroscope(SEM)images，X．raydiffraction(XRD)spectrumandhighresolutionelectronmicroscopic(HRTM)images，theyareexcitedby355，80Oand1150nmlaserpulsewithdifferentexcitationpowerdensities，respectively．TheDhot01uminescence(PL)performancefromthementio

6、nedsamplesareexperimentallystudiedandtheoreticallyanalyzedbythewayofray—tracemethod，thefinite—difference—time-domaintechniqueisemployedtoinvestigatetheirmorphology—denpendedcharacteristics．Itisfoundthatinthetermsofemissionwavelength，averagemodespacing，lasingthres

7、holdandqualityfactor，sampleswithmorebiggerradialsizehavebetterPLperformance．Thenanotubesandnanorodswiththesameradialsizehaveveryfamiliaremissioncharacteristics．acap—likesamplewiththesamesizecapworkingaswhisperinggallerymodes(WGMs)cavity，performedbetteremissioncha

8、racteristicswitharelative1owthreshold，thefrequencyup-conversionemission，inducedbytwoandthree．photon—absorptionisonlyobservedfromthecap—likesamples．Basedonthesi