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- Title
Precise-Integration Time-Domain Formulation for Optical Periodic Media.
- Authors
Sirvent-Verdú, Joan Josep; Francés, Jorge; Márquez, Andrés; Neipp, Cristian; Álvarez, Mariela; Puerto, Daniel; Gallego, Sergi; Pascual, Inmaculada
- Abstract
A numerical formulation based on the precise-integration time-domain (PITD) method for simulating periodic media is extended for overcoming the Courant-Friedrich-Levy (CFL) limit on the time-step size in a finite-difference time-domain (FDTD) simulation. In this new method, the periodic boundary conditions are implemented, permitting the simulation of a wide range of periodic optical media, i.e., gratings, or thin-film filters. Furthermore, the complete tensorial derivation for the permittivity also allows simulating anisotropic periodic media. Numerical results demonstrate that PITD is reliable and even considering anisotropic media can be competitive compared to traditional FDTD solutions. Furthermore, the maximum allowable time-step size has been demonstrated to be much larger than that of the CFL limit of the FDTD method, being a valuable tool in cases in which the steady-state requires a large number of time-steps.
- Subjects
ANISOTROPY; DICHROIC filters; FINITE difference time domain method; COMPUTATIONAL electromagnetics; PERMITTIVITY
- Publication
Materials (1996-1944), 2021, Vol 14, Issue 24, p7896
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma14247896