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  • 标题:Plasmonic field guided patterning of ordered colloidal nanostructures
  • 本地全文:下载
  • 作者:Xiaoping Huang ; Xiaoping Huang ; Kai Chen
  • 期刊名称:Nanophotonics
  • 印刷版ISSN:2192-8606
  • 电子版ISSN:2192-8614
  • 出版年度:2019
  • 卷号:8
  • 期号:3
  • 页码:505-512
  • DOI:10.1515/nanoph-2018-0211
  • 出版社:Walter de Gruyter GmbH
  • 摘要:

    Nano-patterned colloidal plasmonic metasurfaces are capable of manipulation of light at the subwavelength scale. However, achieving controllable lithography-free nano-patterning for colloidal metasurfaces still remains a major challenge, limiting their full potential in building advanced plasmonic devices. Here, we demonstrate plasmonic field guided patterning (PFGP) of ordered colloidal metallic nano-patterns using orthogonal laser standing evanescent wave (LSEW) fields. We achieved colloidal silver nano-patterns with a large area of 30 mm2 in <10 min by using orthogonal LSEW fields with a non-focused ultralow fluence irradiation of 0.25 W cm−2. The underlying mechanism of the formation of the nano-patterns is the light-induced polarization of the nanoparticles (NPs), which leads to a dipole-dipole interaction for stabilizing the nano-pattern formation, as confirmed by polarization-dependent surface-enhanced Raman spectroscopy. This optical field-directed self-assembly of NPs opens an avenue for designing and fabricating reconfigurable colloidal nano-patterned metasurfaces in large areas.

  • 关键词:ordered colloidal nanostructures ; plasmonic field guided patterning ; polarization stabilizing
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