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金纳米颗粒对量子点荧光自发辐射的影响

Effect of Gold Nanoparticles on Fluorescence Spontaneous Emission of Quantum Dots

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摘要

基于时间相关单光子计数技术,研究了金纳米颗粒对CdSe/ZnS量子点荧光自发辐射的影响。制备了与金纳米颗粒有效耦合的量子点样品,测量了高浓度量子点样品的荧光寿命,发现金纳米颗粒能够显著降低量子点的荧光寿命。研究了单量子点的荧光特性,发现单量子点与金纳米颗粒耦合时,荧光寿命降低到无金纳米颗粒时的1%左右。通过数值计算,研究了量子点偏振方向,量子点与金纳米颗粒间的距离,以及金纳米颗粒直径等参数对量子点荧光自发辐射速率的影响。

Abstract

The effect of gold nanoparticles on the fluorescence spontaneous emission of CdSe/ZnS quantum dots (QDs) is investigated based on the time-correlated single photon counting technique. The quantum dot samples coupled with gold nanoparticles effectively are prepared. The fluorescence lifetime of QDs with a high concentration is measured, and it is found that the fluorescence lifetime of QDs can be significantly reduced by the gold nanoparticles. The fluorescence properties of a single QD are also studied and it is found that the fluorescence lifetime of the quantum dot coupled with gold nanoparticles is reduced to about one percent of that without gold nanoparticles. The effects of the polarization direction of QDs, the distance between the QDs and the gold nanoparticles, the diameters of gold nanoparticles and other parameters on the fluorescence spontaneous emission rate of QDs are investigated by the numerical calculation.

Newport宣传-MKS新实验室计划
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中图分类号:O436

DOI:10.3788/lop55.071601

所属栏目:材料

基金项目:国家自然科学基金(61775105, 11504270)、 高等学校学科创新引智计划(B16027)

收稿日期:2018-01-05

修改稿日期:2018-01-15

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作者单位    点击查看

万佳宁:南开大学电子信息与光学工程学院现代光学研究所光学信息技术科学教育部重点实验室, 天津 300350
林雨:南开大学电子信息与光学工程学院现代光学研究所光学信息技术科学教育部重点实验室, 天津 300350
钟莹:天津大学精密仪器与光电子工程学院精密测试技术及仪器国家重点实验室, 天津 300072
刘海涛:南开大学电子信息与光学工程学院现代光学研究所光学信息技术科学教育部重点实验室, 天津 300350

联系人作者:刘海涛(liuht@nankai.edu.cn)

备注:万佳宁(1993—),男,硕士研究生,主要从事微纳光学方面的研究。 E-mail: wan_jn@qq.com

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引用该论文

Wan Jianing,Lin Yu,Zhong Ying,Liu Haitao. Effect of Gold Nanoparticles on Fluorescence Spontaneous Emission of Quantum Dots[J]. Laser & Optoelectronics Progress, 2018, 55(7): 071601

万佳宁,林雨,钟莹,刘海涛. 金纳米颗粒对量子点荧光自发辐射的影响[J]. 激光与光电子学进展, 2018, 55(7): 071601

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