Publications of the Research Group Computational Photonics

Prof. Dr. Antonio Calà Lesina

Parallel FDTD Modeling of Nonlocality in Plasmonics

authored by
Joshua Baxter, Antonio Cala Lesina, Lora Ramunno
Abstract

As nanofabrication techniques become more precise, with ever smaller feature sizes, the ability to model nonlocal effects in plasmonics becomes increasingly important. While nonlocal models based on hydrodynamics have been implemented using various computational electromagnetics techniques, the finite-difference time-domain (FDTD) version has remained elusive. Here we present a comprehensive FDTD implementation of nonlocal hydrodynamics, including for parallel computing. As a sub-nanometer step size is required to resolve nonlocal effects, a parallel implementation makes the computational cost of nonlocal FDTD more affordable. We first validate our algorithms for small spherical metallic particles, and find that nonlocality smears out staircasing artifacts at metal surfaces, increasing the accuracy over local models. We find this also for a larger nanostructure with sharp extrusions. The large size of this simulation, where nonlocal effects are clearly present, highlights the importance and impact of a parallel implementation in FDTD.

Organisation(s)
Institute of Transport and Automation Technology
Hannover Centre for Optical Technologies (HOT)
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
External Organisation(s)
University of Ottawa
Type
Article
Journal
IEEE Transactions on Antennas and Propagation
Volume
69
Pages
3982 - 3994
No. of pages
13
ISSN
0018-926X
Publication date
21.12.2020
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Electrical and Electronic Engineering
Electronic version(s)
https://doi.org/10.1109/TAP.2020.3044579 (Access: Open)