Managing light polarization via plasmon-molecule interactions within an asymmetric metal nanoparticle trimer

被引:212
作者
Shegai, Timur [2 ]
Li, Zhipeng [1 ]
Dadosh, Tali [3 ]
Zhang, Zhenyu [4 ,5 ]
Xu, Hongxing [1 ,6 ]
Haran, Gilad [2 ]
机构
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
[2] Weizmann Inst Sci, Dept Chem Phys, IL-76100 Rehovot, Israel
[3] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel
[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[5] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[6] Lund Univ, Div Solid State Phys, S-22100 Lund, Sweden
基金
美国国家科学基金会; 以色列科学基金会;
关键词
generalized Mie theory; single-molecule Raman scattering; plasmonics;
D O I
10.1073/pnas.0808365105
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The interaction of light with metal nanoparticles leads to novel phenomena mediated by surface plasmon excitations. In this article we use single molecules to characterize the interaction of surface plasmons with light, and show that such interaction can strongly modulate the polarization of the emitted light. The simplest nanostructures that enable such polarization modulation are asymmetric silver nanocrystal trimers, where individual Raman scattering molecules are located in the gap between two of the nanoparticles. The third particle breaks the dipolar symmetry of the two-particle junction, generating a wavelength-dependent polarization pattern. Indeed, the scattered light becomes elliptically polarized and its intensity pattern is rotated in the presence of the third particle. We use a combination of spectroscopic observations on single molecules, scanning electron microscope imaging, and generalized Mie theory calculations to provide a full picture of the effect of particles on the polarization of the emitted light. Furthermore, our theoretical analysis allows us to show that the observed phenomenon is very sensitive to the size of the trimer particles and their relative position, suggesting future means for precise control of light polarization on the nanoscale.
引用
收藏
页码:16448 / 16453
页数:6
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