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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
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Ideal Magnetic Dipole Scattering.

Tianhua Feng1, Yi Xu1,2, Wei Zhang1

  • 1Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China.

Physical Review Letters
|May 13, 2017
PubMed
Summary
This summary is machine-generated.

We demonstrate tunable ideal magnetic dipole scattering using nonmagnetic nanoparticles. By overlapping magnetic dipole resonance with the anapole mode, we achieve strong light scattering in the near-infrared spectrum.

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Area of Science:

  • Nanophotonics
  • Metamaterials
  • Light Scattering

Background:

  • Subwavelength nanoparticles with high refractive indices typically exhibit both electric and magnetic dipole responses.
  • Achieving pure magnetic dipole scattering requires suppressing the electric dipole response, often through anapole modes.

Purpose of the Study:

  • To introduce and demonstrate tunable ideal magnetic dipole scattering from nonmagnetic nanoparticles.
  • To achieve strong scattering resonances in the near-infrared spectrum by manipulating nanoparticle responses.

Main Methods:

  • Utilizing core-shell nanospheres (e.g., Au/Si) and nanodisks to support specific optical resonances.
  • Spectrally overlapping magnetic dipole resonance with the anapole mode to suppress electric dipole scattering.

Main Results:

  • Demonstrated ideal magnetic dipole scattering in the far field.
  • Achieved tunable strong scattering resonances in the near-infrared spectrum.
  • Confirmed the feasibility in multiple nanoparticle geometries compatible with nanofabrication.

Conclusions:

  • Tunable ideal magnetic dipole scattering is achievable in subwavelength nanoparticles.
  • This phenomenon opens possibilities for novel optical devices and applications in the near-infrared range.
  • The proposed method is compatible with existing nanofabrication techniques.