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Proceedings Paper

Control light propagation and polarization with plasmons for surface-enhanced Raman scattering
Author(s): Hong Wei; Zhipeng Li; Yurui Fang; Feng Hao; Timur Shegai; Tali Dadosh; Yingzhou Huang; Wenzhong Wang; Zhenyu Zhang; Gilad Haran; Peter Nordlander; Hongxing Xu
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Paper Abstract

Surface plasmon resonances in metal nanostructures can lead to novel optical properties. The greatly enhanced electromagnetic field makes surface-enhanced Raman scattering (SERS) a highly sensitive spectroscopic technique. We employed Ag nanowires as plasmonic waveguide and achieved remote-excitation SERS at a few molecules level. The junctions between metal nanowires and nanoparticles offer hot spots for SERS, while the enhancement strongly depends on the laser polarization. We studied the polarization dependence in Au nanowire-nanoparticle systems of different geometry. The polarization of Raman-scattered light in SERS is a rarely studied topic. We found nanoantennas composed of a few nanoparticles can manipulate the polarization of emission light. A nanoparticle trimer is the simplest nanoantenna to realize the polarization control. By tuning the position and size of the third particle, emission polarization can be modified in a controllable way. In addition, the refractivity of the surrounding media also plays a crucial role for the emission polarization.

Paper Details

Date Published: 2 September 2009
PDF: 12 pages
Proc. SPIE 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V, 73950T (2 September 2009); doi: 10.1117/12.826527
Show Author Affiliations
Hong Wei, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Zhipeng Li, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Yurui Fang, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Feng Hao, Rice Univ. (United States)
Timur Shegai, Weizmann Institute of Science (Israel)
Tali Dadosh, Weizmann Institute of Science (Israel)
Yingzhou Huang, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Wenzhong Wang, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Central Univ. for Nationalities (China)
Zhenyu Zhang, Oak Ridge National Lab. (United States)
Univ. of Tennessee (United States)
Gilad Haran, Weizmann Institute of Science (Israel)
Peter Nordlander, Rice Univ. (United States)
Hongxing Xu, Beijing National Lab. for Condensed Matter Physics (China)
Institute of Physics (China)
Lund Univ. (Sweden)


Published in SPIE Proceedings Vol. 7395:
Plasmonics: Nanoimaging, Nanofabrication, and their Applications V
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)

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