Article

Applied Physics B

, Volume 100, Issue 1, pp 159-168

First online:

FDTD modeling of realistic semicontinuous metal films

  • U. K. ChettiarAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue UniversityDepartment of Electrical and Systems Engineering, University of Pennsylvania Email author 
  • , P. NygaAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue UniversityInstitute of Optoelectronics, Military University of Technology
  • , M. D. ThoresonAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue UniversityGraduate School for Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg
  • , A. V. KildishevAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University
  • , V. P. DrachevAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University
  • , V. M. ShalaevAffiliated withBirck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University

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Abstract

We have employed a parallelized 3D FDTD (finite-difference time-domain) solver to study the electromagnetic properties of random, semicontinuous, metal films. The structural features of the simulated geometries are exact copies of the fabricated films and are obtained from SEM images of the films themselves. The simulation results show good agreement with the experimentally observed far-field spectra, allowing us to also study the nonlinear moments of the optical responses for these realistic nanostructures.

These results help to further our understanding of the details of the electromagnetic response of randomly structured metal films. Our results can also be applied in the optimization of random metal nanostructures and in the design of surface-enhanced spectroscopies and other plasmonic applications.