Nanoantenna structures for the detection of phonons in nanocrystals

Alexander G. Milekhin, Sergei A. Kuznetsov, Ilya A. Milekhin, Larisa L. Sveshnikova, Tatyana A. Duda, Ekaterina E. Rodyakina, Alexander V. Latyshev, Volodymyr M. Dzhagan, Dietrich R.T. Zahn

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We report a study of the infrared response by localized surface plasmon resonance (LSPR) modes in gold micro- and nanoantenna arrays with various morphologies and surface-enhanced infrared absorption (SEIRA) by optical phonons of semiconductor nanocrystals (NCs) deposited on the arrays. The arrays of nano- and microantennas fabricated with nano- and photolithography reveal infrared-active LSPR modes of energy ranging from the mid to far-infrared that allow the IR response from very low concentrations of organic and inorganic materials deposited onto the arrays to be analyzed. The Langmuir-Blodgett technology was used for homogeneous deposition of CdSe, CdS, and PbS NC monolayers on the antenna arrays. The structural parameters of the arrays were confirmed by scanning electron microscopy. 3D full-wave electromagnetic simulations of the electromagnetic field distribution around the micro- and nanoantennas were employed to realize the maximal SEIRA enhancement for structural parameters of the arrays whereby the LSPR and the NC optical phonon energies coincide. The SEIRA experiments quantitatively confirmed the computational results. The maximum SEIRA enhancement was observed for linear nanoantennas with optimized structural parameters determined from the electromagnetic simulations. The frequency position of the feature's absorption seen in the SEIRA response evidences that the NC surface and transverse optical phonons are activated in the infrared spectra.

Original languageEnglish
Pages (from-to)2646-2656
Number of pages11
JournalBeilstein Journal of Nanotechnology
Volume9
DOIs
Publication statusPublished - 5 Oct 2018

Keywords

  • Localized surface plasmon resonance
  • Metal nanoclusters
  • Nanoantenna
  • Phonons
  • Semiconductor nanocrystals
  • Surface-enhanced infrared absorption
  • VIBRATIONAL-MODES
  • RAMAN-SPECTROSCOPY
  • metal nanoclusters
  • nanoantenna
  • ARRAYS
  • MONOLAYERS
  • QUANTUM DOTS
  • surface-enhanced infrared absorption
  • PLASMONIC ENHANCEMENT
  • SHAPE
  • localized surface plasmon resonance
  • ENHANCED INFRARED-ABSORPTION
  • SURFACE
  • OPTICAL PHONONS
  • phonons
  • semiconductor nanocrystals

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