Mechanical Deformation–Assisted Fabrication of Plasmonic Nanobowties with Broken Symmetry and Tunable Gaps

Yue Feng Liu, Runyu Zhang, Paul V. Braun

Research output: Contribution to journalArticlepeer-review

Abstract

A symmetry broken and gap tunable gold nanobowtie array is demonstrated by nanosphere lithography performed on a mechanically uniaxially prestretched elastomeric substrate. Due to symmetry breaking of each nanotriangle with its three neighboring nanotriangles once the uniaxial prestretch is released, the structure exhibits polarization-dependent optical properties. In addition, the decrease in the gap between adjacent triangles provided by mechanical relaxation of the substrate enhances the electric field enhancement between adjacent triangles, which in turn results in enhanced Raman scattering from molecules present in the gap. Triangle apex-to-apex gaps as small as 20 nm are generated using a colloidal crystal formed from 500 nm colloids on at 30% prestretched substrate (gaps formed when an unstretched substrate is used are ≈115 nm).

Original languageEnglish (US)
Article number1900463
JournalParticle and Particle Systems Characterization
Volume37
Issue number2
DOIs
StatePublished - Feb 1 2020

Keywords

  • broken symmetry
  • mechanical deformation-assisted
  • plasmonic nanobowties
  • tunable gaps

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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