High-Throughput Fabrication of Bimetallic Au–Ag Annular Nanogap Arrays Featuring 5 nm Gaps for Surface-Enhanced Raman Spectroscopy
The confinement of light into nanometer-sized (typically <10 nm) metallic nanogaps can generate extremely high near-field enhancement, dramatically boosting absorption, emission, and Raman scattering of target molecules situated within the gaps. However, the scarcity of cost-effective, reliable, and high-throughput n...