Calculating Scattering Spectra using Time-domain Modeling of Time-modulated Systems
Keywords:
cavity resonators, finite-difference time-domain method, time-varying circuitsAbstract
Obtaining agreement between theoretical predictions that assume single-frequency excitation and finite-difference time-domain (FDTD) simulations that employ broadband excitation in the presence of time-varying materials is challenging due to frequency mixing. A simple solution is proposed to reduce artifacts in FDTD-calculated spectra from the frequency mixing induced by harmonic refractive index modulation applicable to scenarios in which second order and higher harmonics are negligible. Advantages of the proposed method are its simplicity and applicability to arbitrary problems including resonant structures.
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References
S. A. Stewart, T. J. Smy, and S. Gupta, “Finite-difference time-domain modeling of space?time-modulated metasurfaces,” IEEE Transactions on Antennas and Propagation, vol. 66, pp. 281–292, 2017.
A. Mock, “Time-modulated Coupled-cavity System for Optical Switching,” submitted to 2020 International Applied Computational Electromagnetics (ACES) Symposium, Monterey, CA, USA, March 2020, paper 1061.
W. Suh, Z. Wang, and S. Fan, “Temporal coupled-mode theory and the presence of non-orthogonal modes in lossless multimode cavities,” IEEE Journal of Quantum Electronics, vol. 40, pp. 1511–1518, 2004.
