Vibrational near-field mapping of planar and buried three-dimensional plasmonic nanostructures

Daniel Dregely (), Frank Neubrech, Huigao Duan, Ralf Vogelgesang and Harald Giessen
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Daniel Dregely: 4th Physics Institute and Research Center SCoPE, University of Stuttgart
Frank Neubrech: 4th Physics Institute and Research Center SCoPE, University of Stuttgart
Huigao Duan: College of Physics and Microelectronics, Hunan University
Ralf Vogelgesang: Physics Institute, University of Oldenburg
Harald Giessen: 4th Physics Institute and Research Center SCoPE, University of Stuttgart

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3237

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