Strong Plasmon-Mie Resonance in Si@Pd Core-Ω Shell Nanocavity

Area of Science:

• Nanophotonics
• Materials Science
• Optics

Background:

• Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) enhance hot electron generation in plasmonic nanocavities.
• Silicon nanostructures offer potential for optical applications but require enhanced light-matter interactions.

Purpose of the Study:

• To develop a Si@Pd core-shell nanocavity for enhanced nonlinear optical responses.
• To investigate the synergistic effect of plasmon-Mie resonance on silicon nanosphere luminescence.
• To explore applications in biological imaging and nanoscale light sources.

Main Methods:

• Fabrication of Si@Pd core-shell nanocavities by sputtering Pd nanomembranes on Si nanospheres.
• Induction of plasmon-Mie resonance through coupling plasmon and Mie resonances.
• Excitation of the nanocavity using a near-infrared-1 (650 nm-900 nm) femtosecond laser.

Main Results:

• Achieved significant enhancement in Si nanosphere luminescence intensity due to synergistic plasmon-Mie resonance.
• Demonstrated control over the nanocavity's resonant modes via resonance coupling.
• Observed multi-dimensional nonlinear optical responses.

Conclusions:

• The Si@Pd core-shell nanocavity effectively enhances silicon luminescence through coupled plasmon-Mie resonance.
• This approach offers a pathway to advanced nonlinear optical phenomena.
• The developed nanocavity shows promise for applications in biological imaging and nanoscale light sources.