Switching of localized surface plasmon resonance of gold nanoparticles using phase-change materials and implementation of computing functionality

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Abstract

Modulation of the localized surface plasmon resonance (LSPR) of gold nanospheres was investigated using a GeSbTe (GST) film as an active medium. Single-particle spectroscopy of AuNPs placed on a GST film and AuNPs on a GST/Au film (metal–insulator–metal sandwich structure) was performed, and significant switching behavior of the LSPR band due to the interaction with GST was observed. The switching mechanism was explained in terms of a change in the dielectric function of GST, and modification of the surface morphology accompanying the volume expansion and reduction of GST. To go beyond this single-particle switching functionality, we discuss the possible implementation of computing functionality that emerges from spatial correlation due to the near-field interaction of switching elements. We demonstrate that the temporal and spatial evolution of plasmon phase-change material array system can be equivalent to a cellular automata algorithm. The possibility of solving a spin-glass problem was also investigated using a coupled plasmon particle system, in which the individual coupling strengths can be modified to optimize the system so that the exact solution can be easily reached.

Original languageEnglish
Article number577
JournalApplied Physics A: Materials Science and Processing
Volume123
Issue number9
DOIs
Publication statusPublished - 2017 Sep 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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