Open AccessResonant Field Enhancements from Metal Nanoparticle Arrays
Author(s) -
Dentcho A. Genov,
Andrey K. Sarychev,
Vladimir M. Shalaev,
Alexander Wei
Publication year - 2003
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/nl0343710
Subject(s) - raman scattering , materials science , nanoparticle , scattering , field (mathematics) , electromagnetic field , radiative transfer , nanophotonics , nanotechnology , boundary value problem , metal , raman spectroscopy , yield (engineering) , near and far field , computational physics , chemical physics , physics , optics , composite material , quantum mechanics , mathematics , pure mathematics , metallurgy
Theoretical and semiempirical studies of two-dimensional (2D) metal nanoparticle arrays under periodic boundary conditions yield quantitative estimates of their electromagnetic (EM) field factors, revealing a critical relationship between particle size and interparticle spacing. A new theory based on the RLC circuit analogy has been developed to produce analytical values for EM field enhancements within the arrays. Numerical and analytical calculations suggest that the average EM enhancements for Raman scattering (G h ) can approach 2 × 1011 for Ag nanodisks (5 × 1010 for Au) and 2 × 109 for Ag nanosphere arrays (5 × 108 for Au). Radiative losses related to retardation or damping effects are less critical to the EM field enhancements from periodic arrays compared to that from other nanostructured metal substrates. These findings suggest a straightforward approach for engineering nanostructured arrays with direct application toward surface-enhanced Raman scattering (SERS).
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom