Resonant antenna probes for tip-enhanced infrared near-field microscopy

Florian Huth, Andrey Chuvilin, Martin Schnell, Iban Amenabar, Roman Krutokhvostov, Sergei Lopatin, Rainer Hillenbrand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

We report the development of infrared-resonant antenna probes for tip-enhanced optical microscopy. We employ focused-ion-beam machining to fabricate high-aspect ratio gold cones, which replace the standard tip of a commercial Si-based atomic force microscopy cantilever. Calculations show large field enhancements at the tip apex due to geometrical antenna resonances in the cones, which can be precisely tuned throughout a broad spectral range from visible to terahertz frequencies by adjusting the cone length. Spectroscopic analysis of these probes by electron energy loss spectroscopy, Fourier transform infrared spectroscopy, and Fourier transform infrared near-field spectroscopy corroborates their functionality as resonant antennas and verifies the broad tunability. By employing the novel probes in a scattering-type near-field microscope and imaging a single tobacco mosaic virus (TMV), we experimentally demonstrate high-performance mid-infrared nanoimaging of molecular absorption. Our probes offer excellent perspectives for optical nanoimaging and nanospectroscopy, pushing the detection and resolution limits in many applications, including nanoscale infrared mapping of organic, molecular, and biological materials, nanocomposites, or nanodevices.

Original languageEnglish (US)
Pages (from-to)1065-1072
Number of pages8
JournalNano Letters
Volume13
Issue number3
DOIs
StatePublished - Mar 13 2013
Externally publishedYes

Keywords

  • FIB
  • Near-field microscopy
  • infrared antennas
  • infrared nanospectroscopy
  • resonant near-field probes
  • s-SNOM

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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