SERS polarization dependence of Ag nanorice dimer on metal and dielectric film

[Display omitted] •The strong SERS polarization dependence of Ag nanorice dimer on metal or dielectric film has been demonstrated.•The induced image charge on metal film pays a great contribution to the enhancement of SERS intensity.•The small nanorice of heterodimer owns a perfect ability to gather...

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Bibliographic Details
Published in:Chemical physics letters 2017-09, Vol.684, p.373-377
Main Authors: Zang, Yuying, Shi, Haiyang, Huang, Yingzhou, Zeng, Xiping, Pan, Liang, Wang, Shuxia, Wen, Weijia
Format: Article
Language:English
Subjects:
Ag nanorice
Polarization dependence
SERS
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Summary:[Display omitted] •The strong SERS polarization dependence of Ag nanorice dimer on metal or dielectric film has been demonstrated.•The induced image charge on metal film pays a great contribution to the enhancement of SERS intensity.•The small nanorice of heterodimer owns a perfect ability to gather energy. The polarization dependence plays a great impact on the SERS intensities for the surface plasmon coupling between nanoparticle aggregating. In this work, the SERS intensities collected from nanorice heterogeneous dimer or homogeneous dimer on Au, ITO and glass substrates exhibit strong polarization dependence. This result is further analyzed by the simulated surface charge distribution and electromagnetic enhancement distribution. Our data illustrate that SERS polarization dependence exhibits in all gaps in whole system, not only the gaps between nanorices but also gaps between nanorices and film, which could be important for the application of SERS as an ultrasensitive sensing technique.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2017.07.027