Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume 31, Issue 24, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217979217400057
Keywords
Nonlocal optical response; plasmon damping; convective diffusive theory
Funding
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7) under REA grant [609405]
- VILLUM Fonden via the VKR Centre of Excellence NATEC-II
- Danish Council for Independent Research [FNU 1323-00087]
- Danish National Research Council [DNRF103]
- VILLUM Fonden
- Villum Fonden [00016498] Funding Source: researchfish
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The origin and importance of nonlocal damping is discussed through simulations with the generalized nonlocal optical response (GNOR) theory, in conjunction with time-dependent density functional theory (TDDFT) calculations and equivalent circuit modeling, for some of the most typical plasmonic architectures: metal dielectric interfaces, metal dielectric metal gaps, spherical nanoparticles and nanoparticle dimers. It is shown that diffusive damping, as introduced by the convective diffusive GNOR theory, describes well the enhanced losses and plasmon broadening predicted by ab initio calculations in few-nm particles or few-to-sub-nm gaps. Through the evaluation of a local effective dielectric function, it is shown that absorptive losses appear dominantly close to the metal surface, in agreement with TDDFT and the mechanism of Landau damping due to generation of electron hole pairs near the interface. Diffusive nonlocal theories provide therefore an efficient means to tackle plasmon damping when electron tunneling can be safely disregarded, without the need to resort to more accurate, but time-consuming fully quantum-mechanical studies.
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