Journal
NANO LETTERS
Volume 9, Issue 2, Pages 887-891Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl803811g
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Funding
- U.S. Army Research Laboratory
- the U.S. Army Research Office [W911NF-04-1-0203]
- Robert A. Welch Foundation [C-1222]
- NSF [CNS-01421109]
- Research Corporation for Science Advancement
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Using time-dependent density functional theory, we present a fully quantum mechanical investigation of the plasmon resonances in a nanoparticle dimer as a function of interparticle separation. We show that for dimer separations below 1 nm quantum mechanical effects, such as electron tunneling across the dimer junction and screening, significantly modify the optical response and drastically reduce the electromagnetic field enhancements relative to classical predictions. For larger separations, the dimer plasmons are well described by classical electromagnetic theory.
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