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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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SERS polarization-dependent effects for an ordered 3D plasmonic tilted silver nanorod array.

Renxian Gao1, Yongjun Zhang, Fan Zhang

  • 1Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, College of Physics, Jilin Normal University, Changchun 130103, P. R. China. yjzhang@jlnu.edu.cn chenlei@jlnu.edu.cn.

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|April 20, 2018
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Summary
This summary is machine-generated.

Uniformly tilted silver nanorod arrays were fabricated. Increasing nanorod tilt angle enhances surface-enhanced Raman spectroscopy (SERS) polarization dependence, explained by 3D electromagnetic simulations of hotspot distribution.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Uniform hexagonal close-packed silver nanorod arrays are crucial for plasmonic applications.
  • Controlling nanostructure geometry influences optical and electromagnetic properties.

Purpose of the Study:

  • To prepare uniformly tilted silver nanorod arrays with controlled tilt angles.
  • To investigate the effect of nanorod tilt on surface-enhanced Raman spectroscopy (SERS) polarization dependence.
  • To elucidate the underlying electromagnetic mechanisms using 3D simulations.

Main Methods:

  • Fabrication of tilted silver nanorod arrays via sputtering with controlled angles.
  • Characterization using surface-enhanced Raman spectroscopy (SERS) with polarized laser excitation.
  • Numerical simulation of 3D electromagnetic enhancement distribution and hotspot analysis.

Main Results:

  • Achieved excellent uniformity and reproducibility in tilted Ag nanorod arrays.
  • Observed increased SERS polarization dependence with increasing nanorod tilt angle.
  • Identified hotspot distribution as the key factor for SERS polarization effects through simulations.

Conclusions:

  • Fabrication method allows precise control over nanorod tilt angle and gap size.
  • Nanorod tilt angle significantly impacts SERS polarization sensitivity.
  • 3D electromagnetic simulations quantitatively explain the observed SERS polarization dependence.