Green's Function Integral Equation Methods in Nano-Optics

Thomas M. Søndergaard (Aalborg University, Northern Jutland, Denmark)

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English

CRC Press
02 October 2023

Light (optics); Nanotechnology; Electrical engineering; Laser technology & holography

This book gives a comprehensive introduction to Green’s function integral equation methods (GFIEMs) for scattering problems in the field of nano-optics. First, a brief review is given of the most important theoretical foundations from electromagnetics, optics, and scattering theory, including theory of waveguides, Fresnel reflection, and scattering, extinction, and absorption cross sections. This is followed by a presentation of different types of GFIEMs of increasing complexity for one-, two-, and three-dimensional scattering problems. In GFIEMs, the electromagnetic field at any position is directly related to the field at either the inside or the surface of a scattering object placed in a reference structure. The properties of the reference structure, and radiating or periodic boundary conditions, are automatically taken care of via the choice of Green’s function. This book discusses in detail how to solve the integral equations using either simple or higher-order finite-element-based methods; how to calculate the relevant Green’s function for different reference structures and choices of boundary conditions; and how to calculate near-fields, optical cross sections, and the power emitted by a local source. Solution strategies for large structures are discussed based on either transfer-matrix-approaches or the conjugate gradient algorithm combined with the Fast Fourier Transform. Special attention is given to reducing the computational problem for three-dimensional structures with cylindrical symmetry by using cylindrical harmonic expansions.

Each presented method is accompanied by examples from nano-optics, including: resonant metal nano-particles placed in a homogeneous medium or on a surface or waveguide; a microstructured gradient-index-lens; the Purcell effect for an emitter in a photonic crystal; the excitation of surface plasmon polaritons by second-harmonic generation in a polymer fiber placed on a thin metal film; and anti-reflective, broadband absorbing or resonant surface microstructures. Each presented method is also accompanied by guidelines for software implementation and exercises.

Features

Comprehensive introduction to Green’s function integral equation methods for scattering problems in the field of nano-optics

Detailed explanation of how to discretize and solve integral equations using simple and higher-order finite-element approaches

Solution strategies for large structures

Guidelines for software implementation and exercises

Broad selection of examples of scattering problems in nano-optics

By: Thomas M. Søndergaard (Aalborg University Northern Jutland Denmark)
Imprint: CRC Press
Country of Publication: United Kingdom
Dimensions: Height: 234mm, Width: 156mm,
Weight: 1.750kg
ISBN: 9781032653129
ISBN 10: 1032653124
Pages: 430
Publication Date: 02 October 2023
Audience: Professional and scholarly , Undergraduate
Format: Paperback
Publisher's Status: Active

Introduction. Theoretical Foundation. One-dimensional Scattering Problems. Surface Integral Equation Method for 2D Scattering Problems. Area Integral Equation Method for 2D Scattering Problems. Volume Integral Equation Method for 3D Scattering Problems. Volume Integral Equation Method for Cylindrically Symmetric Structures. Surface Integral Equation Method for 3D scattering Problems. Chapter A: Residue Theorem. Chapter B: Conjugate Gradient Algorithm. Chapter C: Generalized Minimum Residual Algorithm. Chapter D: Bessel Functions. Chapter E: Analytic Scattering from a Cylinder and a Sphere. Chapter F: Calculating Guided Modes of Planar Waveguides. References.

Dr. Thomas Søndergaard is currently an Associate Professor in Nano Optics, Aalborg University, Denmark. His areas of expertise include numerical methods for theoretical analysis of electromagnetic fields in micro- and nanostructures. Plasmonics: waveguiding, optical antennas, resonators and sensors based on a type of electromagnetic surface wave at metal-dielectric interfaces known as Surface Plasmon Polaritons. Photonic crystals: wavelength-scale periodic structures in which light with certain wavelengths cannot propagate, similar to electrons with certain energies not being able to progagate in semiconductors, and how this can be exploited for e.g. designing optical waveguides and cavities. Green’s function integral equation methods. Dr. Sondergaard has been awarded The Danish Independent Research Councils' Young Researcher's Award (2006) and The Danish Optical Society Award (2008). He is a board member of the Danish Optical Society and reviewer of 15-20 papers per year for such journals as Physical Review B, Physical Review Letters, Applied Physics Letters, Optics Express, IEEE Journal of Quantum Electronics, IEEE Journal of Lightwave Technology, Optics Communications, Physica status solidi (b), Nature Photonics, Optics Letters, and Journal of the Optical Society of America A/B. Dr. Sondergaard has also been published 84 papers in peerreviewed journals and holds three patents.