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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...

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Updated: May 20, 2026

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Magnetic light.

Arseniy I Kuznetsov1, Andrey E Miroshnichenko, Yuan Hsing Fu

  • 1Data Storage Institute, 5 Engineering Drive I, 117608 Singapore. Arseniy_K@dsi.a-star.edu.sg

Scientific Reports
|July 7, 2012
PubMed
Summary
This summary is machine-generated.

Silicon nanoparticles exhibit tunable magnetic resonance in the visible spectrum. This discovery enables low-loss optical metamaterials and nanophotonic devices.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Related Experiment Videos

Last Updated: May 20, 2026

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

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Published on: June 13, 2010

Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics
07:42

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Published on: February 19, 2017

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

  • Nanophotonics and Metamaterials
  • Optical properties of semiconductor nanoparticles

Background:

  • Spherical silicon nanoparticles (Si-NPs) of hundreds of nanometers exhibit unique optical properties.
  • Theoretical predictions suggest Si-NPs can support strong magnetic resonances in the visible range, similar to split-ring resonators but with lower losses.
  • Si-NPs offer the potential to tune magnetic resonance wavelengths into the visible spectrum.

Purpose of the Study:

  • To experimentally demonstrate the existence of strong magnetic dipole resonance in silicon nanoparticles.
  • To show that the magnetic resonance wavelength can be continuously tuned across the visible spectrum by varying particle size.
  • To explore the potential of Si-NPs for developing novel optical metamaterials and nanophotonic devices.

Main Methods:

  • Fabrication of spherical silicon nanoparticles with controlled sizes.
  • Characterization of optical properties using dark-field optical microscopy.
  • Analysis of magnetic resonance phenomena based on Mie theory predictions.

Main Results:

  • Experimental confirmation of strong magnetic dipole resonance in silicon nanoparticles.
  • Demonstration of continuous tuning of magnetic resonance across the visible spectrum by adjusting nanoparticle size.
  • Visual observation of these tunable resonances using dark-field optical microscopy.

Conclusions:

  • Silicon nanoparticles serve as efficient optical systems supporting tunable magnetic dipole resonances.
  • These findings pave the way for the creation of advanced, low-loss optical metamaterials.
  • The tunable optical properties of Si-NPs open new avenues for nanophotonic device applications.