Electromagnetic Scattering in Anisotropic Media
Summary
Electromagnetic scattering in anisotropic media examines how waves interact with materials whose permittivity or permeability varies with direction. Unlike isotropic media, where wave deflection and absorption follow uniform laws, anisotropic structures induce direction-dependent phase shifts and amplitude changes, leading to rich angular scattering patterns and polarisation effects. The theoretical framework relies on Maxwell’s equations coupled with tensor descriptions of material response, yielding boundary-value problems that often require advanced analytical or numerical techniques. Interest in this field spans remote sensing of layered geological formations, radar cross-section engineering, photonic device design and the development of invisibility cloaks. Recent progress has been driven by the advent of metamaterials and metasurfaces that exploit engineered anisotropy to tailor scattering signatures, while improvements in computational electromagnetics have enabled more accurate modelling of complex media. Practical applications include stealth technology, sub-wavelength imaging, optical communications and non-destructive testing, all of which benefit from the ability to predict, control and minimise unwanted scattering.
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Electromagnetic Scattering in Anisotropic Media publication trend
The graph below shows the total number of articles in electromagnetic scattering in anisotropic media across all publications each year (not limited to Nature Index journals).
Technical terms
Anisotropic media: Materials whose electromagnetic properties depend on direction.
Permittivity tensor: A matrix describing how an electric field induces polarisation in different directions.
Scattering cross-section: A measure of the effective area that a target presents to incident radiation.
Metasurface: A planar arrangement of subwavelength elements designed to manipulate wavefronts.
Inhomogeneous wave: A wave whose amplitude and phase vary non-uniformly across propagation directions.
Cloaking: The suppression or redirection of scattered fields to render an object invisible to detection.
References
- Complex Refraction Metasurfaces for Locally Enhanced Propagation Through Opaque Media. Laser & Photonics Review (2024).
- Cloaking by shells with radially inhomogeneous anisotropic permittivity. Optics Express (2015).
- An Analytical Study of Electromagnetic Deep Penetration Conditions and Implications in Lossy Media through Inhomogeneous Waves. Materials (2018).
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