关键词: 银纳米颗粒/
周期阵列/
消光效率/
多极子共振
English Abstract
Theoretical study on the optical response features of silver nanoparticles and arrays
Jiang Zhi-Yu1,Wang Zi-Yi1,
Wang Jin-Jin1,
Zhang Rong-Jun1,
Zheng Yu-Xiang1,
Chen Liang-Yao1,
Wang Song-You1,2
1.Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China;
2.Key Laboratory for Information Science of Electromagnetic Waves(MoE), Shanghai 200433, China
Fund Project:Project supported by Fudan's Undergraduate Research Opportunities Program, China (Grant No. 15058) and the National Natural Science Foundation of China (Grant No. 11374055).Received Date:04 March 2016
Accepted Date:26 July 2016
Published Online:05 October 2016
Abstract:The optical properties of nanoparticles and their array are closely related to their surface plasmon resonance of the particle and periodic structure parameters. In this paper, optical response features of single Ag nanosphere and periodical two-dimensional structure arrays are theoretically studied. The Mie theories and the multipole resonance theory are employed in the simulation. For Ag spheres each with a radius of less than 40 nm, one extinction peak can be observed and attributed to electric dipole resonance. When the radius of Ag sphere is more than 40 nm, apart from the peak contributed by the electric dipole, there is a peak of extinction at short wavelength, caused by resonance of the electric quadrupole. Generally, the frequency of multipole resonance decreases with increasing particle radius. The simulated results are in accord with the experimental data. For an infinite two-dimensional Ag-nanosphere arrays, two resonance peaks come from the dipole resonance of single particle and the Wood-Rayleigh anomalous diffraction. The frequency of multipole resonance can be controlled by tuning the size and the periodicity distribution of arrays. This paper provides a significant method to design advanced nanostructures with particular optical properties.
Keywords: Ag-nanoparticle/
periodical arrays/
extinction efficiency/
multipole resonance
