title: Vibrational near-field mapping of planar and buried three-dimensional plasmonic nanostructures.
abstract: Nanoantennas confine electromagnetic fields at visible and infrared wavelengths to volumes of only a few cubic nanometres. Assessing their near-field distribution offers fundamental insight into light-matter coupling and is of special interest for applications such as radiation engineering, attomolar sensing and nonlinear optics. Most experimental approaches to measure near-fields employ either diffraction-limited far-field methods or intricate near-field scanning techniques. Here, using diffraction-unlimited far-field spectroscopy in the infrared, we directly map the intensity of the electric field close to plasmonic nanoantennas. We place a patch of probe molecules with 10 nm accuracy at different locations in the near-field of a resonant antenna and extract the molecular vibrational excitation. We map the field intensity along a dipole antenna and gap-type antennas. Moreover, this method is able to assess the near-field intensity of complex buried plasmonic structures. We demonstrate this by measuring for the first time the near-field intensity of a three-dimensional plasmonic electromagnetically induced transparency structure.
authors.affiliation: 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. d.dregely@physik.uni-stuttgart.de
authors.forename: Daniel
authors.initials: D
authors.lastname: Dregely
authors.forename: Frank
authors.initials: F
authors.lastname: Neubrech
authors.forename: Huigao
authors.initials: H
authors.lastname: Duan
authors.forename: Ralf
authors.initials: R
authors.lastname: Vogelgesang
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen
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