Far- and near-field optical properties of gold nanoparticle ensembles

被引:4
|
作者
Nedyalkov, N. N. [1 ]
Dikovska, A. [1 ]
Dimitrov, I. [1 ]
Nikov, Ru. [1 ]
Atanasov, P. A. [1 ]
Toshkova, R. A. [2 ]
Gardeva, E. G. [2 ]
Yossifova, L. S. [2 ]
Alexandrov, M. T. [2 ]
机构
[1] Bulgarian Acad Sci, Inst Elect, BU-1784 Sofia, Bulgaria
[2] Bulgarian Acad Sci, Inst Expt Morphol Pathol & Anthropol, BU-1113 Sofia, Bulgaria
关键词
gold nanoparticle ensembles; optical properties; plasmon excitation;
D O I
10.1070/QE2012v042n12ABEH014932
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The optical properties of gold nanoparticle clusters are presented from the point of view of their applications in biophotonics, where the absorption and scattering spectra are crucial. Generalised multiparticle Mie theory and finite difference time domain (FDTD) technique are used for theoretical description of the far- and near-field optical properties of two dimensional nanoparticle ensembles. The system under consideration consists of spherical gold nanoparticles from 20 to 200 nm in diameter, forming 2D clusters in water. The properties of the far-field absorption and scattering spectra as a function of the cluster size, particle dimensions, and interparticle distance are investigated for ordered hexagonal structure of the particle arrays. It is found that the absorption efficiency can be shifted to the IR spectral range by increasing array size and decreasing interparticle distance. The increase in the array size also results in enhancement of the scattering efficiency while the absorption is reduced. The near-field intensity distribution is inhomogeneous over the array, as formation of zones with intensity enhancement of about two orders of magnitude is observed in specific areas. The optical properties of an ensemble whose configuration is reproduced from real experiments of gold nanoparticle deposition onto cancer cells are also presented. The results obtained can be used in designing of nanoparticle arrays with applications in biophotonics, bioimaging and photothermal therapy.
引用
收藏
页码:1123 / 1127
页数:5
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