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Enhancing the fluorescence emission by flexible metal-dielectric-metal structures

CAO Wen-jing SUN Li-ze-tong GUO Fu-zhou SONG Jian-tong LIU Xiao CHEN Zhi-hui YANG Yi-biao SUN Fei

曹文静, 孙李泽童, 郭付周, 宋健彤, 刘啸, 陈智辉, 杨毅彪, 孙非. 金属-电介质-金属柔性结构增强荧光发射[J]. 中国光学(中英文), 2022, 15(1): 144-160. doi: 10.37188/CO.2021-0084
引用本文: 曹文静, 孙李泽童, 郭付周, 宋健彤, 刘啸, 陈智辉, 杨毅彪, 孙非. 金属-电介质-金属柔性结构增强荧光发射[J]. 中国光学(中英文), 2022, 15(1): 144-160. doi: 10.37188/CO.2021-0084
CAO Wen-jing, SUN Li-ze-tong, GUO Fu-zhou, SONG Jian-tong, LIU Xiao, CHEN Zhi-hui, YANG Yi-biao, SUN Fei. Enhancing the fluorescence emission by flexible metal-dielectric-metal structures[J]. Chinese Optics, 2022, 15(1): 144-160. doi: 10.37188/CO.2021-0084
Citation: CAO Wen-jing, SUN Li-ze-tong, GUO Fu-zhou, SONG Jian-tong, LIU Xiao, CHEN Zhi-hui, YANG Yi-biao, SUN Fei. Enhancing the fluorescence emission by flexible metal-dielectric-metal structures[J]. Chinese Optics, 2022, 15(1): 144-160. doi: 10.37188/CO.2021-0084

金属-电介质-金属柔性结构增强荧光发射

详细信息
  • 中图分类号: TN815

Enhancing the fluorescence emission by flexible metal-dielectric-metal structures

doi: 10.37188/CO.2021-0084
Funds: Supported by National Natural Science Foundation of China (No. 62175178, No. 11674239); the Central Guidance on Local Science and Technology Development Fund of Shanxi Province (No. YDZJSX2021A013); Program for the Top Young Talents of Shanxi Province; Program for the Sanjin Outstanding Talents of China
More Information
    Author Bio:

    Cao Wen-jing (1994—), female, born in Linfen, Shanxi Province, Master student. Received the bachelor degree from Taiyuan Normal University in 2018; Currently studying at Ministry of Education of New Sensor and Intelligent Control, Taiyuan University of Technology/Shanxi Key Laboratory, major in Condensed Matter Physics, mainly engaged in the research of micro-nano photonics.E-mail: cwjskr@126.com

    Chen Zhi-hui (1984—), male, born in Taiyuan, Shanxi Province. Doctor, professor and doctoral supervisor; Received the bachelor degree from Beijing University of Posts and Telecommunications in 2006 and the doctor degree from the Royal Swedish Institute of technology in 2012. Currently working in the Ministry of Education of New Sensor and Intelligent Control, Taiyuan University of Technology/Shanxi Key Laboratory, mainly engaged in research on micro nano photonics.E-mail: huixu@126.com

    Corresponding author: huixu@126.com
  • 摘要: 增强荧光发射可以提高荧光检测灵敏度、提高LED的亮度,在提高发光器件性能方面具有重要意义。由于金属结构在增强局域场、增强荧光发射方面具有很好效果,而柔性电介质材料具有灵活的可弯曲性特性,本文提出一种由金属-电介质-金属(MDM)组成的柔性结构以增强荧光发射。利用时域有限差分方法系统研究了该结构对量子点定向发射增强的影响。理论计算表明柔性MDM结构局部起伏和弧度对荧光增强起促进作用,且可以使位于结构中心位置量子点的量子效率增强约7倍。此外,还可以改变电介质的折射率和厚度从而实现目标波长的可调谐性。实验结果表明该柔性MDM结构对荧光增强有一定的促进作用,这一发现对未来的显示技术和柔性发光器件都有很大的价值,对高效柔性器件的开发应用具有一定的指导意义。

     

  • 图 1  银和PVA组成的MDM结构模型示意图,其中橙色区域代表银膜,其厚度为d1;蓝色区域代表电介质PVA,其厚度为d2,上层银膜内半径为R,结构所对应圆心角为θ

    Figure 1.  Schematic diagram of the MDM structure model composed of silver and PVA, in which: the orange area represents the silver film with a thickness of d1; the blue area represents the dielectric PVA with a thickness of d2, the inner radius of the upper silver film is R, and the central angle corresponding to the structure is θ

    图 2  (a)不同偏振态下量子点的功率曲线;(b−d)不同偏振态的量子点在波长515 nm处的电场分布图

    Figure 2.  (a) Power curves of quantum dots in different polarization states; (b−d) electric field profiles of quantum dots in different polarization states at 515 nm wavelength

    图 3  在MDM不同圆心角下量子点的功率曲线及珀塞尔因子

    Figure 3.  Power curves and Purcell factors of quantum dots for the MDM structures with different center angles

    图 4  MDM半径不同时,量子点的功率曲线及珀塞尔因子

    Figure 4.  Power curves and Purcell factors of quantum dots for the MDM structures with different radii

    图 5  MDM电介质层厚度及折射率不同时量子点发光功率曲线

    Figure 5.  Luminous power curves of quantum dots for the MDM structures with different dielectric layer thicknesses and refractive indexes

    图 6  MDM不同上下层银膜厚度时量子点发光功率曲线和珀塞尔因子

    Figure 6.  Luminous power curves and Purcell factors of quantum dots for the MDM structures with different upper and lower silver film thicknesses

    图 7  490 nm波长下,金属-电介质-金属结构、金属-电介质结构、金属结构中量子点发光的电场分布图、功率曲线和珀塞尔因子

    Figure 7.  The electric field distribution diagrams, power curves and Purcell factors for quantum dots in metal-dielectric-metal structure, metal-dielectric structure and metal structure at 490 nm wavelength

    图 8  位于MDM结构和柔性PVA基底中不同位置的(a)两相干光源和(b)两非相干光源的远场荧光功率曲线

    Figure 8.  Far-field fluorescence power curves of (a) two coherent dipole sources and (b) two incoherent dipole sources located at different positions in the MDM structure and flexible PVA substrate

    图 9  MDM结构制备工艺流程图

    Figure 9.  Preparation process flow chart of MDM structure

    图 10  MDM结构。(a)平面;(b)弯曲(俯视图)

    Figure 10.  MDM structures. (a) planar; (b) curved (top view)

    图 11  光学显微镜下MDM结构的(a)明场图像;(b)375nm激光照射下的暗场发光图像

    Figure 11.  (a) Bright field image of MDM structure under optical microscope; (b) dark field luminescence image under 375nm laser irradiation

    图 12  PL收集过程

    Figure 12.  PL collection process

    图 13  实验所得PL曲线

    Figure 13.  PL curve obtained from the experiment

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出版历程
  • 收稿日期:  2021-04-19
  • 修回日期:  2021-05-11
  • 录用日期:  2021-08-11
  • 网络出版日期:  2021-08-11
  • 刊出日期:  2022-01-19

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