Regulation of Light Absorption with Position of Au Particles in a Au@Carbon Sphere Composite Structure

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

Abstract

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

CLC Number:

TB333

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.

Figures/Tables 6

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

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.)

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°

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

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°

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

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