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Determining plasmonic hot-carrier energy distributions via single-molecule transport measurements

Journal Article · · Science
 [1];  [2];  [3];  [2];  [2];  [4];  [4];  [5];  [6];  [5];  [6];  [2]
  1. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.; OSTI
  2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
  3. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.; Center for Science of Information, Purdue University, West Lafayette, IN 47907, USA.
  4. Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK.
  5. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.; Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
  6. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.

Hot carriers in plasmonic nanostructures, generated via plasmon decay, play key roles in applications such as photocatalysis and in photodetectors that circumvent bandgap limitations. However, direct experimental quantification of steady-state energy distributions of hot carriers in nanostructures has so far been lacking. We present transport measurements from single-molecule junctions, created by trapping suitably chosen single molecules between an ultrathin gold film supporting surface plasmon polaritons and a scanning probe tip, that can provide quantification of plasmonic hot-carrier distributions. Our results show that Landau damping is the dominant physical mechanism of hot-carrier generation in nanoscale systems with strong confinement. The technique developed in this work will enable quantification of plasmonic hot-carrier distributions in nanophotonic and plasmonic devices.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0004871
OSTI ID:
1801606
Journal Information:
Science, Journal Name: Science Journal Issue: 6502 Vol. 369; ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

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