Related Experiment Video
Updated: Jul 4, 2026
11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Radiation and scattering from imperfect cylindrical electromagnetic cloaks
1Institute of Physics, Pregrevica 118, P. O. Box 68, 11080 Belgrade, Serbia. isicg@phy.bg.ac.yu
Optics Express
|June 11, 2008
Summary
This study analyzes imperfect electromagnetic invisibility cloaks using nonsingular mappings. The research confirms that these approximations offer a practical approach to cloaking device design and performance evaluation.
Area of Science:
- Electromagnetism
- Metamaterials
- Optics
Background:
- Electromagnetic invisibility cloaks rely on singular mappings for material parameters.
- Ideal singular mappings are not physically realizable, necessitating approximate methods.
- Asymptotic analysis is crucial for understanding imperfect cloaking devices.
Purpose of the Study:
- To analyze the performance of electromagnetic invisibility cloaks with imperfect, nonsingular mappings.
- To provide a more feasible approach to designing and understanding cloaking devices.
- To investigate the impact of imperfections on cloaking performance.
Main Methods:
- Utilizing nonsingular mappings that asymptotically approach ideal singular mappings.
- Solving scattering and radiation problems for imperfect cylindrical cloaks analytically.
- Validating analytical results with full-wave finite element simulations.
Main Results:
- Analytical solutions for scattering and radiation from imperfect cloaks were obtained.
- Finite element simulations confirmed the accuracy of the analytical findings.
- The study quantifies the influence of nonsingular mapping imperfections on cloaking.
Conclusions:
- Nonsingular mappings provide a practical and effective method for analyzing electromagnetic cloaks.
- The approach offers insights into the physics of cloaking devices and their performance limitations.
- This work advances the understanding and design of imperfect invisibility cloaks.
Related Concept Videos
01:30Plane Electromagnetic Waves I
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
The EM field is assumed to be a...
01:17Radiation: Applications
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
01:30Electromagnetic Waves in Matter
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
01:10Dual Nature of Electromagnetic (EM) Radiation
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
01:20Momentum And Radiation Pressure
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
01:24Electromagnetic Wave Equation
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations: What...
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations: What...