Individual Template-Stripped Conductive Gold Pyramids for Tip-Enhanced Dielectrophoresis

Jincy Jose, Stephan Kress, Avijit Barik, Lauren M. Otto, Jonah Shaver, Timothy W. Johnson, Zachary J. Lapin, Palash Bharadwaj, Lukas Novotny, Sang Hyun Oh

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Gradient fields of optical, magnetic, or electrical origin are widely used for the manipulation of micro- and nanoscale objects. Among various device geometries to generate gradient forces, sharp metallic tips are one of the most effective. Surface roughness and asperities present on traditionally produced tips reduce trapping efficiencies and limit plasmonic applications. Template-stripped, noble metal surfaces and structures have sub-nm roughness and can overcome these limits. We have developed a process using a mix of conductive and dielectric epoxies to mount template-stripped gold pyramids on tungsten wires that can be integrated with a movable stage. When coupled with a transparent indium tin oxide (ITO) electrode, the conductive pyramidal tip functions as a movable three-dimensional dielectrophoretic trap which can be used to manipulate submicrometer-scale particles. We experimentally demonstrate the electrically conductive functionality of the pyramidal tip by dielectrophoretic manipulation of fluorescent beads and concentration of single-walled carbon nanotubes, detected with fluorescent microscopy and Raman spectroscopy. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)464-470
Number of pages7
JournalACS Photonics
Volume1
Issue number5
DOIs
StatePublished - May 21 2014

Keywords

  • dielectrophoresis
  • gradient force
  • particle trapping
  • plasmonics
  • template stripping

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