Au@碳球复合结构中Au颗粒位置调控光吸收

doi:10.19596/j.cnki.1001-246x.8314

摘要/Abstract

摘要：

采用时域有限差分（FDTD）法研究Au纳米颗粒@碳球（AuNPs@CS）复合结构的光吸收控制。发现Au纳米颗粒@碳球复合结构中Au颗粒的位置可以控制复合结构光吸收。模型计算中选取两粒Au纳米颗粒以最佳深度（0 nm）嵌入碳球表面。当两粒Au颗粒球心与碳球球心夹角为22.5°和45°时，复合结构光吸收较单一碳球光吸收明显增强；当夹角为315°、270°、180°、90°时，光吸收增量逐渐减小；当夹角为337.5°时，光吸收量低于单一碳球。这一结果主要归因于Au纳米颗粒位置变化可引起表面等离子体光强度和光散射方向的变化。改变碳球表面Au纳米颗粒的数量和位置，可以进一步调节AuNPs@CS复合结构的光吸收。

关键词: 表面等离子激元, 时域有限差分法, Au纳米颗粒, 碳球, 光吸收

Abstract:

Light absorption of Au nanoparticles@carbon sphere (AuNPs@CS) composite structure is investigated with finite difference time domain (FDTD) method. It shows that light absorption of AuNPs@CS composite structure is effectively controlled by position of Au nanoparticle.Two Au nanoparticles are selected and embedded on the surface of the carbon sphere at an optimal depth (0 nm). As the angle between the particle center of Au and the spheroid core of carbon sphere is 22.5° and 45°, light absorption is enhanced than that of a single carbon sphere; As the angles between them are 315°, 270°, 180° and 90°, the increment of light absorption decreases gradually; At an angle of 337.5° between them, the optical absorption is significantly lower than that of a single carbon sphere. It may be attributed to the change of Au nanoparticles position, which causes the change of light intensity and scattering direction of the surface plasmon. The light absorption of AuNPs@CS composite structure can be adjusted by varying the number and position of Au nanoparticle on the surface of carbon sphere.

Key words: surface plasmon polariton, finite difference time domain, Au nanoparticle, carbon sphere, light absorption

中图分类号:

TB333

孙杰, 程仁寨, 李云, 房洪杰, 汪洪波, 陈小龙. Au@碳球复合结构中Au颗粒位置调控光吸收[J]. 计算物理, 2021, 38(6): 735-741.

Jie SUN, Renzhai CHENG, Yun LI, Hongjie FANG, Hongbo WANG, Xiaolong CHEN. Regulation of Light Absorption with Position of Au Particles in a Au@Carbon Sphere Composite Structure[J]. Chinese Journal of Computational Physics, 2021, 38(6): 735-741.

图/表 6

图1 波长为400 nm~700 nm复色光照射下，单粒Au纳米颗粒在碳膜中的近场光分布，嵌入深度为(a) 0 nm，(b) 20 nm，(c) 40 nm，(d) 60 nm；(e)、(f)分别为波长为400 nm和700 nm单色光照射下，Au颗粒在碳膜中嵌入深度为0 nm的近场光分布

Fig.1 Nearfield light distributions of single Au nanoparticle embedding in carbon film under the illumination of polychromatic light wavelength ranging from 400 nm to 700 nm with embedding depth (a) 0 nm, (b) 20 nm, (c) 40 nm, (d) 60 nm; (e) and (f) are near field light distributions of Au particles embedded in a carbon film at a depth of 0 nm under the irradiation of monochromatic light with wavelength of 400 nm and 700 nm, respectively

图2 单粒Au纳米颗粒、独立碳膜以及Au颗粒在碳膜中不同嵌入深度的光吸收(插入图像是矩形线框标记的局部放大图。)

Fig.2 Light absorption of a single Au nanoparticle, independent carbon films and Au nanoparticle embeded in carbon film (Inserted images are enlarged drawings in marked rectangles.)

图3 两粒Au纳米颗粒在碳球表面的近场光分布, 与碳球球心连线夹角为(a) 22.5°，(b) 45°，(c) 90°，(d) 337.5°，(e) 315°，(f) 270°

Fig.3 Near field light distributions of two Au nanoparticles on the surface of carbon sphere, angle between connections with carbon sphere center is (a) 22.5°, (b) 45°, (c) 90°, (d) 337.5°, (e) 315°, (f) 270°

图4 两粒Au纳米颗粒在碳球表面不同嵌入位置复合结构的光吸收

Fig.4 Light absorption of two Au nanoparticles on the surface of a carbon sphere with different embedding position

图5 两对Au纳米颗粒在碳球表面的近场光分布(a)22.5°和270°，(b)22.5°和337.5°，(c)90°和337.5°，(d)90°和270°

Fig.5 Near field light distributions of two pair of Au nanoparticles on the surface of carbon sphere (a) 22.5° and 270°, (b) 22.5° and 337.5°, (c) 90° and 337.5°, (d) 90° and 270°

图6 不同组合Au纳米颗粒在碳球表面的复合结构光吸收

Fig.6 Light absorption of Au nanoparticles of different combinations on the surface of a carbon sphere

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