Effects of Quantum Tunneling in Metal Nano-gap on Surface-Enhanced Raman Scattering

Details Effects of Quantum Tunneling in Metal Nano-gap on Surface-Enhanced Raman Scattering Effects of Quantum Tunneling in Metal Nano-gap on Surface-Enhanced Raman Scattering

2009-01-06

arxiv.org/abs/0901.0607v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The quantum tunneling effects between two metallic plates are studied using the time dependent density functional theory. Results show that the tunneling is mainly dependent on the separation and the initial local field of the interstice between plates. The smaller separation and larger local field, the easier the electrons tunnels through the interstice. Our numerical calculation shows that when the separation is smaller than 0.6 nm the quantum tunneling dramatically reduce the enhancing ability of interstice between nanoparticles.

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