This book presents a detailed analytical and computational electromagnetic (CEM) treatment of guided electromagnetic (EM) wave propagation in independently time-varying dielectric medium, using the finite-difference time-domain (FDTD) simulation technique. The contents provide an extensive literature review, explaining the importance of time-varying media (temporal photonic crystals) in new exotic applications that involve rich EM phenomena such as parametric amplification, frequency conversion, non-reciprocal gain, electromagnetic energy accumulation, temporal coating and temporal aiming (beam-forming). A one-dimensional (1D) FDTD simulation paradigm is then formulated in this book, starting from Maxwell's equations and boundary conditions. The issues of hard/soft source realizations, perfectly matched layers (PMLs), choice of simulation parameters (cell-size and time-stepping) are thoroughly explained through new visualization tools. This book provides a unique combination of rigorous analytical techniques, several FDTD simulation examples with reproducible source-codes, and new visualization/post-processing mechanisms. The contents of this book should prove to be useful for students, research scholars, scientists and engineers, working in the field of applied electromagnetics, and aiming to design cutting-edge microwave/optical devices based on time-varying medium.

Reproducible 1D-FDTD source code developed from scratch and included in the appendix Comprehensive summary of theoretical background and analytical treatments for the time modulated medium Several numerical examples explain the impact of individual time-varying medium parameters

Autorentext

Dr. Debdeep Sarkar completed B.E. in ETCE from Jadavpur University in 2011, and his M.Tech. and Ph.D. in Electronics Engineering from Indian Institute of Technology (IIT) Kanpur, in 2013 and 2018 respectively. He has worked as Visiting Researcher and Post-doctoral fellow in RMC Canada, respectively during May 2017-Aug 2017 and Nov 2018-Feb 2020. Dr. Sarkar is currently an Assistant Professor in department of Electronics and Communications Engineering, Indian Institute of Science (IISc), Bangalore. His research interests include antenna system design and algorithm development for next general wireless communication, body area networks as well as Radar systems, wireless power transfer, and energy harvesting applications. Dr. Sarkar has authored/co-authored more than 30 peer-reviewed journal papers and more than 50 international/national conference papers so far. Dr. Sarkar is the recipient of the 'URSI Young Scientist Award' (YSA) twice, respectively in the URSI General Assembly (GASS), 2020 and URSI Asia-Pacific Radio Science Conference (AP-RASC), 2019.

Inhalt
Introduction.- One-Dimensional (1D) FDTD Method: Background Theory and Formulation.- EM Wave Propagation in Dielectric Medium with Sinusoidal Time Modulation.- EM Wave Propagation in Dielectric Medium with Step-Periodic Modulation.- Conclusion and Future Scopes.