Experimental Evidence for Axial Anisotropy beyond the Diffraction Limit Induced with a Bias Voltage Plasmonic Nanoantenna and Longitudinal Optical Near-Fields in Photoreactive Polymer Thin Films

Sergey S. Kharintsev, Alexander I. Fishman, Sergei G. Kazarian, Ildar R. Gabitov, Myakzyum Kh Salakhov

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This work highlights a mechanism for inducing axial anisotropy in side-chain nitroazobenzene (NAB) polymer thin films based on the combined effect of both local dc electrical poling and the longitudinal optical near-field. We show that highly anisotropic NAB chromophores are effectively oriented in the glassy environment under optical pumping with 632.8 nm excitation wavelength, which is out of the absorption band of chromophores. Axial anisotropy across the polymer thin film and its non-centrosymmetric behavior beyond the diffraction limit are experimentally rendered with tip-enhanced Raman scattering microscopy and scanning Kelvin probe microscopy. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)1025-1032
Number of pages8
JournalACS Photonics
Volume1
Issue number10
DOIs
Publication statusPublished - 15 Oct 2014
Externally publishedYes

Keywords

  • dc electrical field poling
  • light-induced molecular motion
  • optical anisotropy
  • optical near-field poling
  • tip-enhanced Raman scattering
  • trans-cis photoisomerization

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