Three-Dimensional FDTD Simulation of Superconducting Terahertz Emitters Using an Effective Medium Approximation
Abstract
Compact and tunable terahertz (THz) sources with controllable polarization are sought for high-speed links, spectroscopy, and imaging. In superconducting THz emitters based on a cuprate Bi2Sr2CaCu2O8+δ, which have the potential to satisfy such properties, modeling often relies on heavy nonlinear solvers or empirical isotropic dielectrics, obscuring anisotropy, plasma response, and bias dependence. We derive an anisotropic, dispersive effective permittivity from the Lawrence-Doniach model for a layered superconductor and implement it as a user-defined material in a commercial Finite-difference Time-domain (FDTD) solver. Simulations of two device geometries reproduce linearly polarized emission from a rectangular mesa and low-axial-ratio (near-circular) emission from a truncated square mesa. This CAD-ready workflow links superconducting theory to device design, enabling rapid searches and parameter optimization for next-generation THz sources.
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BibTeX
@misc{kobayashi2026threedimensional,
title = {{Three-Dimensional FDTD Simulation of Superconducting Terahertz Emitters Using an Effective Medium Approximation}},
author = {Ryota Kobayashi and Itsuhiro Kakeya},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00840},
eprint = {2611.00840},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00840},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Three-Dimensional FDTD Simulation of Superconducting Terahertz Emitters Using an Effective Medium Approximation
AU - Ryota Kobayashi
AU - Itsuhiro Kakeya
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00840
UR - https://arxiv.org/abs/2611.00840
AB - Compact and tunable terahertz (THz) sources with controllable polarization are sought for high-speed links, spectroscopy, and imaging. In superconducting THz emitters based on a cuprate Bi_2Sr_2CaCu_2O_8+δ, which have the potential to satisfy such properties, modeling often relies on heavy nonlinear solvers or empirical isotropic dielectrics, obscuring anisotropy, plasma response, and bias dependence. We derive an anisotropic, dispersive effective permittivity from the Lawrence-Doniach model for a layered superconductor and implement it as a user-defined material in a commercial Finite-difference Time-domain (FDTD) solver. Simulations of two device geometries reproduce linearly polarized emission from a rectangular mesa and low-axial-ratio (near-circular) emission from a truncated square mesa. This CAD-ready workflow links superconducting theory to device design, enabling rapid searches and parameter optimization for next-generation THz sources.
ER -