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金属-介质-金属渔网超表面结构调控的荧光辐射:空间选择性激发和双增强
引用本文:任 远,鲁拥华,臧天阳,Sonia Ghafoor,王 沛.金属-介质-金属渔网超表面结构调控的荧光辐射:空间选择性激发和双增强[J].化学物理学报,2019,32(3):349-356.
作者姓名:任 远  鲁拥华  臧天阳  Sonia Ghafoor  王 沛
作者单位:中国科学技术大学光学与光学工程系,安徽省光电子科学与技术实验室,合肥 230026,中国科学技术大学光学与光学工程系,安徽省光电子科学与技术实验室,合肥 230026,中国科学技术大学光学与光学工程系,安徽省光电子科学与技术实验室,合肥 230026,中国科学技术大学光学与光学工程系,安徽省光电子科学与技术实验室,合肥 230026,中国科学技术大学光学与光学工程系,安徽省光电子科学与技术实验室,合肥 230026
摘    要:增强荧光辐射在生物成像、高灵敏探测、集成光源等方面都具有重要的应用价值.金属纳米颗粒的周围或者金属纳米结构的间隙都可以产生强的电磁场,相应的,这些结构附近的局域态密度也被极大地增强.虽然增强荧光辐射已经在多种金属纳米颗粒和颗粒对中被证明,但是利用金属纳米结构对荧光分子的吸收和辐射过程同时进行调制仍然是一个有挑战的问题.本文研究了金属-介质-金属超表面对荧光辐射的调控,其中局域表面等离激元(LSP)和磁等离激元(MPP)分別与于分子的吸收和辐射过程发中耦合相互作用.对于吸收过程,LSP的耦合作用使得可以通过旋转泵浦激光的偏振态来实现荧光分子的空间选择激发.此外,MPP模式的偏振依赖特性使得矩形渔网结构中的荧光分子的辐射波长和偏振态也受到调控.实验观测结果经过了时域有限差分模拟的验证.本文报道的纳米结构在光辐射器件和纳米尺度集成光源等方面都具有潜在的应用价值.

关 键 词:表面等离激元,荧光辐射增强,光谱调控,超表面
收稿时间:2018/7/31 0:00:00

Fluorescence Emission Mediated by Metal-Dielectric-Metal Fishnet Metasurface: Spatially Selective Excitation and Double Enhancement
Yuan Ren,Yong-hua Lu,Tian-yang Zang,Sonia Ghafoor and Pei Wang.Fluorescence Emission Mediated by Metal-Dielectric-Metal Fishnet Metasurface: Spatially Selective Excitation and Double Enhancement[J].Chinese Journal of Chemical Physics,2019,32(3):349-356.
Authors:Yuan Ren  Yong-hua Lu  Tian-yang Zang  Sonia Ghafoor and Pei Wang
Institution:Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026, China,Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026, China,Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026, China,Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026, China and Department of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026, China
Abstract:Enhancement of fluorescent radiation is of great importance for applications including biological imaging, high-sensitivity detectors, and integrated light sources. Strong electromagnetic fields can be created around metallic nanoparticles or in gap of nanostructures, where the local state density of radiating mode is then dramatically enhanced. While enhanced fluorescent emission has been demonstrated in many metallic nanoparticles and nanoparticle pairs, simultaneous mediation of absorption and emission processes of fluorescent emitters remains challenging in metallic nanostructures. Here, we investigate fluorescent emission mediated by metal-dielectric-metal fishnet metasurface, in which localized surface plasmon (LSP) and magnetic plasmon polaritons (MPPs) modes are coupled with absorption and emission processes, respectively. For absorption process, coupling of the LSP mode enables spatially-selective excitation of the fluorescent emitters by rotating the polarization of the pump laser beam. In addition, the polarization-dependent MPP mode enables manipulation of both polarization and wavelength of the fluorescent emission by introducing a rectangular fishnet structure. All the experimental observations are further corroborated by finite-difference time-domain simulations. The structure reported here has great potential for application to color light-emitting devices and nanoscale integrated light sources.
Keywords:Surface plasmons  Fluorescence emission enhancement  Spectroscopy modulation  Metasurface
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