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Plasmonic core-shell nano-heterostructures with temperature-dependent optical nonlinearity.

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Summary

This study demonstrates tunable nonlinear optical responses in bimetallic heterostructures using temperature control. Embedded core-shell nanostructures offer enhanced laser tolerance for advanced photonic devices.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Bimetallic heterostructures are crucial for tunable ultrafast dynamics in nonlinear optics.
  • Temperature-controlled nonlinearity modulation in these systems is not well understood.

Purpose of the Study:

  • To investigate temperature-controlled nonlinearity modulation in bimetallic heterostructures.
  • To fabricate and characterize embedded Y@Ag/AgY core-shell nanostructures (CSNs) for tunable nonlinear optical responses.

Main Methods:

  • Fabrication of Y@Ag/AgY core-shell nanostructures (CSNs) embedded in fused silica.
  • Utilizing localized surface plasmon resonance (LSPR) for spatial temperature manipulation.
  • Investigating laser-intensity-dependent temperature effects and size effects on CSNs.

Main Results:

  • Demonstrated tunable nonlinearity via a laser-intensity-dependent temperature switch.
  • Observed modification of LSPR and near-field intensity for temperature control.
  • Achieved a 5.7-fold increase in laser intensity threshold, indicating improved laser tolerance.

Conclusions:

  • Photothermal-effect-controlled nonlinearity modification is achievable in bimetallic heterostructures.
  • The developed CSNs show potential for temperature-sensitive photonic devices operating under extreme conditions.