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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Metastable defects are known in semiconductors but underexplored in nanoplasmonics.
  • Recent interest in defects for information technology applications.
  • Nanoplasmonic materials offer unique optical properties.

Purpose of the Study:

  • To report the first instance of optically active metastable defects in nanoplasmonic materials.
  • To introduce novel active and passive nanoplasmonic materials with switchable defects.
  • To investigate the defect origins and luminescence behaviors in these nanocomposites.

Main Methods:

  • Fabrication of nanocomposites using a sodium-boron-phosphate glass matrix.
  • Doping with silver nanoparticles (nAg) and/or Er3+ ions via NanoParticle Direct Doping.
  • Characterization of optically active metastable defects and their switching mechanisms (cooling, laser illumination).

Main Results:

  • Demonstration of switchable metastable defects in active and passive nanoplasmonic materials.
  • Identification of two distinct defect-related luminescence behaviors: metal-glass (MG1) and metal-glass-rare-earth ion (MGR1) defects.
  • Confirmation of the first report of metastable defects in non-semiconducting nanoplasmonic materials.

Conclusions:

  • The developed nanocomposites exhibit optically controllable metastable defects.
  • These materials show potential for data writing and erasing applications using focused laser illumination.
  • This work opens new avenues for defect engineering in nanoplasmonics for information technology.