Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots

LIU Shu-yu; ZHONG Mian-zeng; MENG Xiu-qing; LI Jing-bo; WANG Yuan-qian; XIAO Si; HE Jun

doi:10.3788/fgxb20153602.0249

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Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots

更新时间：2020-08-12

- Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots
- Chinese Journal of Luminescence Vol. 36, Issue 2, Pages: 249-255(2015)
- 作者机构：
  
  1. 浙江师范大学 LED芯片研发中心,浙江金华,321004
  2. 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
  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
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20153602.0249
  CLC： O433.1
- Received：23 May 2014，
  
  Revised：14 July 2014，
  
  Published Online：12 December 2014，
  
  Published：03 February 2015
- 稿件说明：
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刘姝妤, 钟绵增, 孟秀清等. 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

LIU Shu-yu, ZHONG Mian-zeng, MENG Xiu-qing etc. Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots[J]. Chinese Journal of Luminescence, 2015,36(2): 249-255
刘姝妤, 钟绵增, 孟秀清等. 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 DOI： 10.3788/fgxb20153602.0249.

LIU Shu-yu, ZHONG Mian-zeng, MENG Xiu-qing etc. Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots[J]. Chinese Journal of Luminescence, 2015,36(2): 249-255 DOI： 10.3788/fgxb20153602.0249.

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4.310

-44

sphoton

-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.

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 ~4.310

-44

sphoton

-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

references

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Related Institution

北京信息科技大学仪器科学与光电工程学院, 北京 100192

School of Physics and Electronics, Hunan Key Laboratoryof Super-microstructure and Ultrafast Process, Central South University

Advanced Photonics Center, Southeast University

Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, China

Advanced Photonics Center, Southeast University, Nanjing 210096, China

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