A Single-Crystalline Silver Plasmonic Circuit for Visible Quantum Emitters.

Area of Science:

• Nanophotonics
• Plasmonics
• Materials Science

Background:

• Plasmonic waveguides are crucial for nanophotonic devices, enabling optical interconnects.
• Multimode operation in plasmonic waveguides offers advanced control for near-field manipulation and data encoding.
• Current gold-based plasmonic structures suffer from ohmic losses in the visible spectrum, limiting their use with visible quantum emitters.

Purpose of the Study:

• To overcome the limitations of gold plasmonic waveguides for visible light applications.
• To demonstrate the fabrication of complex plasmonic nanostructures using single-crystalline silver.
• To enable efficient light-matter interactions between plasmonic waveguides and visible quantum emitters.

Main Methods:

• Top-down fabrication of complex plasmonic nanostructures in single-crystalline silver plates.
• Controlled remote excitation of fluorophores using waveguide modes.
• Efficient coupling of visible luminescence into the plasmonic waveguide.

Main Results:

• Successful fabrication of intricate silver-based plasmonic waveguides.
• Demonstrated controlled excitation of visible quantum emitters (fluorophores) via plasmonic modes.
• Achieved high-efficiency emission of visible luminescence into the waveguide.

Conclusions:

• Single-crystalline silver enables plasmonic waveguides that operate efficiently in the visible spectrum.
• This technology facilitates nanoscale light-matter interactions with a broad range of visible quantum emitters.
• Opens new avenues for plasmonic circuitry and nanophotonic devices utilizing visible light.