| ZnO/ZnS核-壳量子点的双光子吸收效应 |
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| 引用本文： | 刘姝妤,钟绵增,孟秀清,李京波,王沅倩,肖思,何军.ZnO/ZnS核-壳量子点的双光子吸收效应[J].发光学报,2015,36(2):249-255. |
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| 作者姓名： | 刘姝妤 钟绵增 孟秀清 李京波 王沅倩 肖思 何军 |
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| 作者单位： | 1. 中南大学物理与电子学院 超微结构与超快过程湖南省重点实验室, 湖南 长沙 410083;
2. 浙江师范大学LED芯片研发中心, 浙江 金华 321004;
3. 中国科学院半导体研究所 超晶格与微结构国家重点实验室, 北京 100083 |
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| 基金项目： | 国家自然科学基金，湖南省自然科学基金，教育部博士学科点专项科研基金，教育部新世纪优秀人才支持计划 |
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| 摘 要： | 利用飞秒激光Z-扫描与泵浦-探测技术,研究了室温下ZnO/ZnS与ZnO/ZnS/Ag核-壳胶体量子点的双光子吸收效应.研究发现:ZnO基核-壳量子点的本征双光子吸收系数比ZnO体材料增大了3个数量级;测量得到的660 nm处的ZnO/ZnS核-壳量子点双光子吸收截面约为4.3×10-44 cm4·s·photon-1,比相应的ZnS、ZnSe及 CdS量子点大2个数量级;当ZnO/ZnS核-壳量子点镶嵌了银纳米点时,非线性吸收有所增强.ZnO基复合纳米结构的双光子吸收增强可归因于量子限域与局域场效应.
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| 关 键 词： | 双光子吸收 ZnO/ZnS核-壳量子点 Z-扫描技术 |
| 收稿时间： | 2014-05-23 |
Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots |
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| LIU Shu-yu,ZHONG Mian-zeng,MENG Xiu-qing,LI Jing-bo,WANG Yuan-qian,XIAO Si,HE Jun.Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots[J].Chinese Journal of Luminescence,2015,36(2):249-255. |
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| Authors: | LIU Shu-yu ZHONG Mian-zeng MENG Xiu-qing LI Jing-bo WANG Yuan-qian XIAO Si HE Jun |
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| Institution: | 1. Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China;
2. Research Center for Light Emitting Diodes (LED), Zhejiang Normal University, Jinhua 321004, China;
3. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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| Abstract: | We report a large two-photon absorption (TPA) in ZnO/ZnS and ZnO/ZnS/Ag core/shell quantum dots (QDs). Z-scan and pump-probe techniques with femtosecond laser pulses were employed to characterized the quantum dots. The intrinsic TPA coefficients of ZnO-based core/shell QDs are enhanced with nearly three orders of magnitude compared to that of ZnO bulk counterpart, which is attributable to quantum confinement effect. The TPA cross-section of ZnO-based nanocomposites is determined to be ~4.3×10-44 cm4·s·photon-1 at the wavelength of 660 nm. This value is at least two orders of magnitude greater than that of ZnS, ZnSe, and CdS QDs. Due to the local field effect, the nonlinear absorption in ZnO/ZnS core/shell QDs is improved as beaded with Ag nano-dots. |
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| Keywords: | two-photon absorption ZnO/ZnS core/shell quantum dots Z-scan technique |
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