Название: Electromagnetic and Photonic Simulation for the Beginner: Finite-Difference Frequency-Domain in MATLAB
Автор: Raymond C. Rumpf
Издательство: Artech House
Год: 2022
Страниц: 355
Язык: английский
Формат: pdf (true)
Размер: 20.9 MB

This book teaches the finite-difference frequency-domain (FDFD) method from the simplest concepts to advanced three-dimensional simulations. It uses plain language and high-quality graphics to help the complete beginner grasp all the concepts quickly and visually. This single resource includes everything needed to simulate a wide variety of different electromagnetic and photonic devices. The book is filled with helpful guidance and computational wisdom that will help the reader easily simulate their own devices and more easily learn and implement other methods in computational electromagnetics.

Special techniques in MATLAB are presented that will allow the reader to write their own FDFD programs. Key concepts in electromagnetics are reviewed so the reader can fully understand the calculations happening in FDFD. A powerful method for implementing the finite-difference method is taught that will enable the reader to solve entirely new differential equations and sets of differential equations in mere minutes. Separate chapters are included that describe how Maxwell’s equations are approximated using finite-differences and how outgoing waves can be absorbed using a perfectly matched layer absorbing boundary. With this background, a chapter describes how to calculate guided modes in waveguides and transmission lines. The effective index method is taught as way to model many three-dimensional devices in just two-dimensions. Another chapter describes how to calculate photonic band diagrams and isofrequency contours to quickly estimate the properties of periodic structures like photonic crystals. Next, a chapter presents how to analyze diffraction gratings and calculate the power coupled into each diffraction order. This book shows that many devices can be simulated in the context of a diffraction grating including guided-mode resonance filters, photonic crystals, polarizers, metamaterials, frequency selective surfaces, and metasurfaces. Plane wave sources, Gaussian beam sources, and guided-mode sources are all described in detail, allowing devices to be simulated in multiple ways. An optical integrated circuit is simulated using the effective index method to build a two-dimensional model of the 3D device and then launch a guided-mode source into the circuit. A chapter is included to describe how the code can be modified to easily perform parameter sweeps, such as plotting reflection and transmission as a function of frequency, wavelength, angle of incidence, or a dimension of the device. The last chapter is advanced and teaches FDFD for three-dimensional devices composed of anisotropic materials. It includes simulations of a crossed grating, a doubly-periodic guided-mode resonance filter, a frequency selective surface, and an invisibility cloak. The chapter also includes a parameter retrieval from a left-handed metamaterial.

Computational electromagnetics (CEM) deals with using a computer to figure out how electric and magnetic fields will behave when interacting with materials and devices. It is especially useful when it is not possible to obtain analytical solutions. I have found skills in CEM to be like having superpowers. The ability to analyze devices and predict how they will behave is an incredible skill to have and will surely accelerate your career. This is the book I wish I had when I was trying to get started in CEM. The FDFD method may be the easiest numerical method to derive and implement that is able to obtain a rigorous solution to Maxwell’s equations. It uses the finitedifference method to solve Maxwell’s equations so the underlying mathematics is mature and well-understood.

The Chapter 1 covers some basic topics related to MATLAB that are useful for implementing the finite-difference frequency-domain (FDFD) method. It is assumed that the reader has a basic familiarity with MATLAB and computer programming. If not, visit the MathWorks website for excellent introductory and tutorial materials. If MATLAB is not available to you, Octave is an excellent open-source alternative that offers close to 100% compatibility with the MATLAB language.

The book includes all the MATLAB codes and detailed explanations of all programs. This will allow the reader to easily modify the codes to simulate their own ideas and devices. The author has created a website where the MATLAB codes can be downloaded, errata can be seen, and other learning resources can be accessed. This is an ideal book for both an undergraduate elective course as well as a graduate course in computational electromagnetics because it covers the background material so well and includes examples of many different types of devices that will be of interest to a very wide audience.