From Local to Nonlocal High-Q Plasmonic Metasurfaces

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Bound states in the continuum (BICs) enable high-quality factor (Q factor) optical resonances in low-loss dielectric structures.
• Metal-dielectric structures supporting surface plasmon polaritons typically suffer from optical losses, hindering high-Q resonances.

Purpose of the Study:

• To develop a strategy for achieving high-Q resonances in plasmonic metasurfaces.
• To overcome the loss limitations in metal-dielectric systems.

Main Methods:

• Tailoring resonant modes within plasmonic metasurfaces.
• Transitioning resonant modes from local to nonlocal regimes.
• Engineering metaunit interactions to control resonance characteristics.

Main Results:

• Demonstrated a comprehensive strategy for high-Q resonance in plasmonic metasurfaces.
• Successfully transitioned from localized to extended resonant modes.
• Showcased effective interaction among neighboring metaunits.

Conclusions:

• The proposed strategy effectively achieves high-Q resonances in plasmonic metasurfaces.
• This approach offers a pathway to mitigate losses in metal-dielectric optical systems.
• The findings pave the way for advanced plasmonic devices with improved performance.