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49 results on '"Jung, Kyung-Young"'

17. On numerical artifacts of the complex envelope ADI-FDTD method

Author

Jung, Kyung-Young, Teixeira, Fernando L., Garcia, Salvador G., and Lee, Robert

Subjects
Simulation methods -- Analysis, Radiation -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

We examine two spurious numerical artifacts of the complex envelope (CE) alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method, viz. spurious charges and anomalous wave propagation (modes with positive phase velocity and negative group velocity). These artifacts are also present in the conventional ADI-FDTD; however, the spurious charges in CE-ADI-FDTD have a fundamental distinction from those of ADI-FDTD: they are static in ADI-FDTD and implicitly time-harmonic in CE-ADI-FDTD. Spurious charges are particularly detrimental to CE-ADI-FDTD simulations because they produce secondary radiation. We also show that spurious charges can be reduced by a fixed-point iterative correction in CE-ADI-FDTD. Index Terms--Alternating-direction-implicit finite-difference time-domain (ADI-FDTD), complex envelope (CE), divergence, spurious mode.

Published
2009

18. Frozen modes in parallel-plate waveguides loaded with magnetic photonic crystals

Author

Chilton, Ryan A., Jung, Kyung-Young, Lee, Robert, and Teixeira, Fernando L.

Subjects
Waveguides -- Design and construction, Photonics -- Research, Electromagnetism -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

We examine parallel-plate magnetic photonic crystal (MPC) waveguides comprised of a periodic loading with two anisotropic layers and one ferrite layer on each period. It is shown that, at a specific design frequency [f.sub.o], parallel-plate MPC waveguides can support a Bluch mode with zero axial group velocity similar to the 'frozen mode' regime of the prototypical I-D MPC structure. When the proposed 2-D structure is illuminated with a properly polarized time-harmonic wave, near unity power transmission (coupling) into the frozen mode occurs, and field strength within the MPC becomes orders of magnitude larger than the incident field strength. The steady-state case is evaluated using both analytical tools and finite elements, while the finite-difference time-domain method is applied to evaluate the 2-D MPC transient response. Index Terms--Dispersion engineering, frozen mode, guidedwave propagation, magnetic photonic crystals (MPCs), numerical techniques in electromagnetics.

Published
2007

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