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Far-field midinfrared superresolution imaging and spectroscopy of single high aspect ratio gold nanowires

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [2];  [3];  [4];  [5];  [3];  [1];  [1];  [6]
  1. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556,
  2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996,
  3. Department of Chemistry, University of Washington, Seattle, WA 98195,
  4. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996,, Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831,
  5. Department of Physics, University of Notre Dame, Notre Dame, IN 46556
  6. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556,, Department of Physics, University of Notre Dame, Notre Dame, IN 46556

Significance

Traditional optical microscopy methods are limited by diffraction. This makes it hard to image and study nanostructures in the midinfrared, a relatively unexplored spectral region of chemical significance. Here we use infrared (IR) photothermal heterodyne imaging (IR-PHI), a far-field superresolution optical technique, to study the Fabry–Pérot resonances of single gold nanowires in the 2,800 to 4,000-cm −1 region. Because the spatial resolution of IR-PHI is on the order of a few hundred nanometers, we are able to directly resolve the structure of the Fabry–Pérot resonances and assign the mode order. This cannot be done with traditional optical measurements. IR absorption spectra recorded using IR-PHI show narrow linewidths, in several cases below the limit imposed by Au’s Drude relaxation parameter.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0018169
OSTI ID:
1592822
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 5 Vol. 117; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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