Related Experiment Video
Updated: Jan 26, 2026

07:51
Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids
Published on: April 10, 2017
10.8K
Directional scattering cancellation for an electrically large dielectric sphere
Optics Letters
|April 16, 2019
Summary
Directional scattering cancellation is achieved for dielectric spheres by applying a finite conductivity coating. This method simplifies finding specific surface conductivities to canceling hundreds of multipolar scattering orders.
Area of Science:
- Electromagnetics
- Optical physics
- Materials science
Background:
- Dielectric spheres exhibit complex scattering patterns due to multipolar resonances.
- Controlling light scattering is crucial for applications in optics and photonics.
- Surface properties significantly influence electromagnetic wave interactions.
Purpose of the Study:
- To demonstrate directional scattering cancellation for dielectric spheres.
- To investigate the effect of finite surface conductivity on scattering.
- To simplify the method for achieving destructive interference in scattering.
Main Methods:
- Coating dielectric spheres with a surface of finite conductivity.
- Analyzing multipolar scattering orders.
- Reducing the problem to finding zeros of a known polynomial.
Main Results:
- Achieved directional scattering cancellation for spheres up to 10 times the incident wavelength.
- Identified specific surface conductivity values for destructive interference.
- Demonstrated that cancellation involves hundreds of multipolar scattering orders.
Conclusions:
- Finite conductivity coatings offer an effective method for controlling light scattering.
- The proposed method provides an analytical solution for achieving directional scattering cancellation.
- This technique has potential implications for advanced optical designs and metamaterials.
More Related Videos
Related Concept Videos
Electric Field of a Non Uniformly Charged Sphere
2.3K
Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
2.3K
Capacitor With A Dielectric
4.9K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.9K
Gauss's Law in Dielectrics
5.1K
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
5.1K
Dielectric Polarization in a Capacitor
5.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.9K
Susceptibility, Permittivity and Dielectric Constant
2.8K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
2.8K
Electrostatic Boundary Conditions in Dielectrics
1.9K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
1.9K

