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新型ZnO纳米针的双光子激射特性 被引量：3

Stimulated Emission Property of Novel ZnO Nanoneedle Pumped by Two-photon
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摘要 室温下采用640nm的飞秒脉冲激光泵浦ZnO纳米针得到双光子诱导的光致发光谱。结合单光子下的研究结果,实验分析了双光子泵浦下样品随着受激能量增强产生的三种紫外发射行为并归结为自由激子自发辐射,激子-激子散射和电子空穴等离子体复合。双光子泵浦下ZnO纳米针的受激阈值是4.82GW/cm2,远小于其他ZnO微纳材料的双光子阈值(TW/cm2)。结果表明:这种新型的ZnO纳米针结构能更有效地产生双光子激射,这在纳米激光器方面将会有很大的应用前景。 Stimulated emissions in a novel nanoneedle ZnO composite with two complex needle parts were investigated using the two-photon induced time-resolved photolumineseence pumped with the femtoseeond pulse at the wavelength of 640 nm in room temperature. Comparing with the results of single-photon pumped, we observe three operation mechanisms of two-photon induced UV emission behaviors with the excitation power increasing： spontaneous emission of free-exciton, exciton-exciton （E-E） scattering and electron-hole-plasma （EHP） recombination. The threshold of two-photon excitation emission is 4.82 GW/cm2 ,which is far lower than that of mirconeedle ZnO reported recently and the other nanostructure of ZnO （ TW/cm2 ）. Our research results proved that the new ZnO nanoneedle structure with UV emission efficiently induced two-photon shows great potential applications in the two-photon induced nanolasers fields.
作者 姜小芳 李小龙 曹俊枫 赵丰华 郭萌祖 扶雄辉 丘志仁 吴明娒
机构地区 中山大学光电材料与技术国家重点实验室 中山大学化学与化工学院
出处 《发光学报》 EI CAS CSCD 北大核心 2010年第1期109-113,共5页 Chinese Journal of Luminescence
基金 国家自然科学基金(50872158) 国家"973"计划(2004CB719804) 广东省自然科学基金(8251027501000010) 广州市科技局推荐项目(2005Z3-C7451)资助项目
关键词 氧化锌 纳米针 受激发射 光致发光 ZnO nanoneedle stimulated emission photoluminescence
分类号 O482.31 [理学—固体物理]
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参考文献23

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同被引文献42

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发光学报
2010年 第1期

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