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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The spheroidal T-matrix formalism developed by Hackman 1-3 and Sammelmann 4-6 for acoustic scattering is extended to electromagnetic scattering from lossy dielectric solids in a conducting medium. The spheroidal T-matrix formalism exhibits superior performance with respect to the spherical T-matrix formalism for objects that deviate appreciably from a spherical shape. Both acoustic (elastic) and electromagnetic scattering are solutions of the vector Helmholtz equation. In the case of elastic wave scattering, the displacement field has 3 degrees of freedom corresponding to the 2 polarization states of the shear wave and the longitudinal mode. In the case of electromagnetic scattering, the electric (magnetic) field has 2 polarization states corresponding to left and right-handed photons, but lacks a longitudinal mode. The T-matrix description of electromagnetism mimics the T-matrix description of elastic wave scattering in the absence of a longitudinal mode. Indeed, the stress tensor of the displacement is replaced by the exterior derivative of the electric field in Betti's identity in the derivation of the T-matrix formalism of scattering from a lossy dielectric solid. Continuity of the displacement and surface traction is replaced by continuity of the tangential components of the electric and magnetic fields in the boundary conditions. In the case of a time harmonic field, the presence of a finite conductivity in the medium is represented by the insertion of an imaginary component of the wavenumber that is proportional to the conductivity in the medium. In the case of complex wavenumber, the Helmholtz equation is no longer a self-adjoint operator, and the S-matrix is no longer unitary. This article describes some of the features unique to scattering in seawater due to the large conductivity of the medium.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The spheroidal T-matrix formalism developed by Hackman 1-3 and Sammelmann 4-6 for acoustic scattering is extended to electromagnetic scattering from lossy dielectric solids in a conducting medium. The spheroidal T-matrix formalism exhibits superior performance with respect to the spherical T-matrix formalism for objects that deviate appreciably from a spherical shape. Both acoustic (elastic) and electromagnetic scattering are solutions of the vector Helmholtz equation. In the case of elastic wave scattering, the displacement field has 3 degrees of freedom corresponding to the 2 polarization states of the shear wave and the longitudinal mode. In the case of electromagnetic scattering, the electric (magnetic) field has 2 polarization states corresponding to left and right-handed photons, but lacks a longitudinal mode. The T-matrix description of electromagnetism mimics the T-matrix description of elastic wave scattering in the absence of a longitudinal mode. Indeed, the stress tensor of the displacement is replaced by the exterior derivative of the electric field in Betti's identity in the derivation of the T-matrix formalism of scattering from a lossy dielectric solid. Continuity of the displacement and surface traction is replaced by continuity of the tangential components of the electric and magnetic fields in the boundary conditions. In the case of a time harmonic field, the presence of a finite conductivity in the medium is represented by the insertion of an imaginary component of the wavenumber that is proportional to the conductivity in the medium. In the case of complex wavenumber, the Helmholtz equation is no longer a self-adjoint operator, and the S-matrix is no longer unitary. This article describes some of the features unique to scattering in seawater due to the large conductivity of the medium.
Author: Frederick Wooten Publisher: Academic Press ISBN: 1483220761 Category : Science Languages : en Pages : 273
Book Description
Optical Properties of Solids covers the important concepts of intrinsic optical properties and photoelectric emission. The book starts by providing an introduction to the fundamental optical spectra of solids. The text then discusses Maxwell's equations and the dielectric function; absorption and dispersion; and the theory of free-electron metals. The quantum mechanical theory of direct and indirect transitions between bands; the applications of dispersion relations; and the derivation of an expression for the dielectric function in the self-consistent field approximation are also encompassed. The book further tackles current-current correlations; the fluctuation-dissipation theorem; and the effect of surface plasmons on optical properties and photoemission. People involved in the study of the optical properties of solids will find the book invaluable.
Author: Yuping Duan Publisher: CRC Press ISBN: 1315341034 Category : Science Languages : en Pages : 382
Book Description
With the phenomenal development of electromagnetic wave communication devices and stealth technology, electromagnetic wave absorbing materials have been attracting attention as antielectromagnetic interference slabs, stealth materials, self-concealing technology, and microwave darkrooms. This book starts with the fundamental theory of electromagnetic wave absorption in loss medium space, followed by a discussion of different microwave absorbents, such as manganese dioxide, iron-based composite powder, conductive polyaniline, barium titanate powder, and manganese nitride. Then, structural absorbing materials are explored, including multilayer materials, new discrete absorbers, microwave absorption coatings, cement-based materials, and structural pyramid materials. Many of the graphics demonstrate not only the principles of physics and experimental results but also the methodology of computing. The book will be useful for graduate students of materials science and engineering, physics, chemistry, and electrical and electronic engineering; researchers in the fields of electromagnetic functional materials and nanoscience; and engineers in the fields of electromagnetic compatibility and stealth design.
Author: Willie J. Padilla Publisher: Morgan & Claypool Publishers ISBN: 1636392601 Category : Science Languages : en Pages : 199
Book Description
Electromagnetic metamaterials are a family of shaped periodic materials which achieve extraordinary scattering properties that are difficult or impossible to achieve with naturally occurring materials. This book focuses on one such feature of electromagnetic metamaterials—the theory, properties, and applications of the absorption of electromagnetic radiation. We have written this book for undergraduate and graduate students, researchers, and practitioners, covering the background and tools necessary to engage in the research and practice of metamaterial electromagnetic wave absorbers in various fundamental and applied settings. Given the growing impact of climate change, the call for innovations that can circumvent the use of conventional energy sources will be increasingly important. As we highlight in Chapter 6, the absorption of radiation with electromagnetic metamaterials has been used for energy harvesting and energy generation, and will help to reduce reliance on fossil fuels. Other applications ranging from biochemical sensing to imaging are also covered. We hope this book equips interested readers with the tools necessary to successfully engage in applied metamaterials research for clean, sustainable energy. This book consists of six chapters. Chapter 1 provides an introduction and a brief history of electromagnetic wave absorbers; Chapter 2 focuses on several theories of perfect absorbers; Chapter 3 discusses the scattering properties achievable with metamaterial absorbers; Chapter 4 provides significant detail on the fabricational processes; Chapter 5 discusses examples of dynamical absorbers; and Chapter 6 highlights applications of metamaterial absorbers.
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Author: Te-Kao Wu
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Author: Nichigai Asoshiētsu
Author: Frederick Wooten
Author: Yuping Duan
Author: Willie J. Padilla