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Unveiling a Counterintuitive Intermode Interplay in a Prototype Plasmonic Nanosystem.

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Summary

We discovered energy transfer from lower-energy to higher-energy modes in gold nanorods, driven by solvent properties. This finding offers new ways to control hot electrons for plasmon-mediated applications.

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Materials Science

Background:

  • Interactions between different plasmon modes in nanostructures are complex.
  • Understanding energy transfer dynamics is crucial for optimizing plasmonic devices.

Purpose of the Study:

  • To demonstrate and explain an unusual energy transfer (EnT) from the longitudinal (L) to the transverse (T) mode in gold nanorods.
  • To investigate the role of the solvent environment in enabling this energy transfer pathway.
  • To explore strategies for harnessing hot electrons in plasmon-mediated applications.

Main Methods:

  • Ultrafast spectroscopy was employed to study the intermode energy transfer.
  • Control experiments were conducted to validate the findings.
  • Comparative studies using different solvents (water and chloroform) were performed.

Main Results:

  • Demonstrated counterintuitive energy transfer (EnT) from the lower-energy longitudinal (L) mode to the higher-energy transverse (T) mode.
  • Identified solvent thermal conductivity as critical for enabling EnT(L→T) via energy upconversion.
  • Observed prolonged hot-electron lifetime and enhanced phonon emission in weaker thermal-conductivity solvents.
  • Addressed a subtle intermode dynamic screening effect.

Conclusions:

  • The solvent environment critically influences intermode energy transfer in gold nanorod plasmonics.
  • Energy upconversion, facilitated by solvent properties, enables L-mode energy transfer to the T mode.
  • This research provides insights into hot electron dynamics and offers strategies for plasmon-mediated applications.