Journal
ACS PHOTONICS
Volume 2, Issue 3, Pages 369-375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph500408e
Keywords
numerical recipe; electron energy-loss spectroscopy (EELS); finite-difference time-domain (FDTD); plasmonic nanostructures; gold nanoparticle; silver dimer; gold nanodisk; bowtie antennas
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Funding
- Robert A. Welch Foundation [C-1222]
- NSF [CNS-0821727]
- Data Analysis and Visualization Cyberinfrastructure under NSF [OCI-0959097]
- Welch Foundation under the J. Evans Attwell-Welch Fellowship for Nanoscale Research
- Nanoscale Science and Technology [L-C-004]
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Electron energy-loss spectroscopy (EELS) is a unique tool that is extensively used to investigate the plasmonic response of metallic nanostructures. We present here a novel approach for EELS calculations using the finite-difference time-domain (FDTD) method (EELS-FDTD). We benchmark our approach by direct comparison with results from the well-established boundary element method (BEM) and published experimental results. In particular, we compute EELS spectra for spherical nanoparticles, nanoparticle dimers, nanodisks supported by various substrates, and a gold bowtie antenna on a silicon nitride substrate. Our EELS-FDTD method can be easily extended to more complex geometries and configurations. This implementation can also be directly exported beyond the FDTD framework and implemented in other Maxwell's equation solvers.
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