Abstract
In the design of nanostructures to perform single molecule surface enhanced Raman spectroscopy (SM-SERS), metallic structures with very narrow gaps (<1 nm) have been shown to contain regions with electric fields compatible with SM-SERS. However, this geometrical condition does not allow many biomolecules to reach the hot-spot regions. Here, we show that optimized branched structures formed by appropriate arrangements of gold nanoparticles with gaps ≥2 nm display field enhancements >102, compatible with SM-SERS.
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