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Nanosecond switchable localized surface plasmons through resettable contact angle behavior in silver nanoparticles.

Krishna P Koirala1, Venkatanarayana P Sandireddy2, Hernando Garcia3

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee, 37996, United States of America.

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Summary

Researchers demonstrate nanosecond switchable localized surface plasmon resonance (LSPR) in silver nanoparticles. This rapid, reversible switching of plasmonic properties offers potential for high-speed plasmonic devices.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Materials Science
  • Laser-Matter Interactions

Background:

  • Localized Surface Plasmon Resonance (LSPR) in metallic nanoparticles is sensitive to their shape and surrounding environment.
  • Controlling LSPR modes (dipole and quadrupole) is crucial for developing advanced optical devices.
  • Existing methods for tuning LSPR often lack speed and reversibility.

Purpose of the Study:

  • To achieve rapid, nanosecond-scale switching of LSPR modes in silver nanoparticles.
  • To investigate the effect of laser-induced morphological changes on LSPR properties.
  • To demonstrate a reusable system for tunable plasmonic devices.

Main Methods:

  • Synthesis of near-spherical silver nanoparticles via UV laser dewetting in glycerol.
  • Induction of shape change in silver nanoparticles using single nanosecond laser pulses in air.
  • Characterization of LSPR shifts due to altered nanoparticle geometry and dielectric environment.
  • Demonstration of reversible LSPR switching by controlled laser irradiation cycles.

Main Results:

  • Nanosecond laser pulse irradiation transformed spherical silver nanoparticles into near-hemispherical shapes.
  • This morphological change caused significant blue-shifts in both dipolar and quadrupolar LSPR modes.
  • The plasmonic switching was reversible and repeatable over multiple cycles.
  • The contact angle of nanoparticles was reset using laser irradiation in glycerol.

Conclusions:

  • Nanosecond switchable LSPR modes are achievable in silver nanoparticles through laser-induced morphological changes.
  • The reversible nature of this switching mechanism enables reusable plasmonic systems.
  • This approach provides a cost-effective pathway for designing high-speed plasmonic devices with tunable wavelength regions.