光学学报, 2020, 40 (4): 0426001, 网络出版: 2020-02-17
金属-介质-金属纳米天线阵列的模式特性及荧光发射调控 
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Mode Properties and Fluorescence Emission Mediation of Metal-Dielectric-Metal Nanoantenna Array
图 & 表
图 1. 仿真模型及仿真结果。(a) MDM纳米天线阵列结构示意图;(b)入射光偏振方向沿x轴时模拟得到的结构白光透射谱;(c) 532 nm共振位置处xoz平面上的电场强度及电场矢量分布图;(d) 671 nm共振位置处xoz平面上的电场强度及电场矢量分布图
Fig. 1. Simulation model and simulation results. (a) Schematic of MDM nanoantenna array structure; (b) simulated transmission spectrum of white light when polarization direction of incident light is along x axis; (c) electric field intensity and electric vector distribution map on xoz plane at resonant position of 532 nm; (d) electric field intensity and electric vector distribution map on xoz plane at resonant position of 671 nm
图 2. 结构参数的变化对共振位置的影响。(a)模拟得到的结构透射谱; (b) MPP模式的共振位置随d的变化曲线
Fig. 2. Influence of structure parameters on resonance position. (a) Simulated transmission spectrum of the proposed structure; (b) change curve of resonance position of MPP mode with respect to d
图 4. 不同长度l和不同偏振角度对共振位置的影响。(a)模拟得到的结构透射谱; (b) LSP和MPP模式的共振位置随l的变化曲线;(c) l为90 nm,w为120 nm,步长为15°时的结构透射谱
Fig. 4. Influence of different length l and polarization angle on resonance position. (a) Simulated transmission spectrum of proposed structure; (b) variation of resonance position of LSP and MPP modes with l; (c) simulated transmission spectra of proposed structure, when l is 90 nm, w is 120 nm and step size is 15°
图 5. MDM渔网超表面。(a)MDM渔网超表面的结构示意图;(b)入射光偏振方向沿x轴时模拟得到的结构透射谱
Fig. 5. MDM fishnet metasurface. (a) Schematic of MDM fishnet metasurface; (b) simulated transmission spectra when polarization direction of incident light is along x axis
图 6. 激发光波长为532 nm时,模拟得到的介质层内xoy平面上的总场电场强度和x、y、z方向分场电场强度分布。(a)~(d) θ=0°; (e)~(h) θ=45°; (i)~(l) θ=90°
Fig. 6. Total electric field and electric field in x, y, and z direction on xoy plane in dielectric layer when excitation light wavelength is 532 nm. (a)-(d) θ =0°; (e)-(h) θ=45°; (i)-(l) θ=90°
图 7. 偶极子的位置以及对应的性质。(a)(c)(e)偶极子位于不同位置处的结构示意图;(b)(d)(f)偶极子的发光分子的辐射和非辐射衰减速率增强因子、Purcell因子以及量子效率
Fig. 7. Positions of dipole and corresponding properties. (a)(c)(e) Schematic when dipole is located at different positions; (b)(d)(f) radiative and non-radiative decay rate enhancement factor, Purcell factor and quantum efficiency of luminescent molecules of dipole
图 8. 荧光辐射峰位于650 nm时MDM渔网超表面和MDM纳米天线阵列结构的量子效率
Fig. 8. Quantum efficiency of MDM fishnet metasurface and MDM nanoantenna structure when peak of fluorescent emission is at 650 nm
图 9. x和y方向上电场强度的各方向分量分布。 (a)~(c)偶极子受到x方向偏振的激发光激发时,在635 nm处测得的结果;(d)~(f)偶极子受到y方向偏振的激发光激发时,在770 nm处测得的结果
Fig. 9. Distribution of electric field intensity in each direction at x and y direction. (a)-(c) Results are obtained at 635 nm when dipole is excited by the x polarization laser; (d)-(f) results are obtained at 770 nm when dipole is excited by the y polarization laser
王晗, 臧昊峰, 鲁拥华, 王沛. 金属-介质-金属纳米天线阵列的模式特性及荧光发射调控[J]. 光学学报, 2020, 40(4): 0426001. Han Wang, Haofeng Zang, Yonghua Lu, Pei Wang. Mode Properties and Fluorescence Emission Mediation of Metal-Dielectric-Metal Nanoantenna Array[J]. Acta Optica Sinica, 2020, 40(4): 0426001.
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