Plasmonic tooth-multilayer structure with high enhancement field for surface enhanced Raman spectroscopy

Area of Science:

• Nanotechnology
• Materials Science
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) requires plasmonic structures for strong light confinement.
• Existing fabrication methods for plasmonic nanostructures face limitations in reproducibility or feature size.

Purpose of the Study:

• To propose and demonstrate a novel tooth multilayer structure for advanced SERS applications.
• To achieve sub-10 nm feature sizes and high reproducibility in plasmonic nanostructures.

Main Methods:

• Fabrication using physical vapor deposition (ion-beam sputtering) and selective wet etching.
• Precise control over nanometer-scale layer thicknesses and nanogap depths.
• Creation of alternating material multilayers on a flat substrate.

Main Results:

• Achieved extremely small feature sizes and high reproducibility in the fabricated structures.
• Controlled nanogap dimensions at the sub-10 nm length scale.
• Demonstrated high enhancement and tunable resonance modes suitable for SERS.

Conclusions:

• The proposed tooth multilayer structure offers a viable solution for fabricating high-performance SERS substrates.
• The combination of deposition and etching techniques enables precise control over nanostructure dimensions.
• This approach significantly advances the potential of SERS applications through improved plasmonic properties.