Large local optical activity in fractal aggregates of nanoparticles

被引：55

作者：

Drachev, VP ^{[1
]}

Bragg, WD

Podolskiy, VA

Safonov, VP

Kim, WT

Ying, ZC

Armstrong, RL

Shalaev, VM

机构：

[1] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[2] Inst Semicond Phys, Novosibirsk 630090, Russia

[3] Inst Automat & Electrometry, Novosibirsk 630090, Russia

[4] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2001年 / 18卷 / 12期

关键词：

D O I：

10.1364/JOSAB.18.001896

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Large local optical activity in fractal aggregates of silver nanoparticles has been observed by means of photon scanning tunneling microscopy. The effect occurs because resonant plasmon modes in random fractals can have handedness in spatial distribution of their amplitudes, In agreement with experimental observations, numerical simulations show dramatic difference in dipole-moment distributions for right- and left-circularly polarized incident light when the cluster size is comparable with or larger than the wavelength. Variations in the local parameter describing the circular intensity difference of scattered light show that fractal aggregates are characterized by broad and random distributions of chiral plasmon modes. (C) 2001 Optical Society of America.

引用

页码：1896 / 1903

页数：8

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