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Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Related Experiment Video

Updated: May 16, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Published on: November 21, 2019

Adjustable magneto-optical isolators with flat-top responses.

Mehdi Zamani1, Majid Ghanaatshoar

  • 1Laser and Plasma Research Institute, Shahid Beheshti University, GC, Evin, 1983963113 Tehran, Iran.

Optics Express
|November 29, 2012
PubMed
Summary

Researchers developed thin, flat-top magneto-optical isolators (MOIs) using one-dimensional magnetophotonic crystals (MPCs). Applied magnetic fields allow for precise adjustment of these perfect MOIs, achieving a 7.2 nm flat-top width.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Materials Science

Background:

  • Magneto-optical isolators (MOIs) are crucial for preventing back reflections in optical systems.
  • One-dimensional magnetophotonic crystals (MPCs) offer tunable optical properties through magnetic field application.
  • Achieving flat-top spectral responses in MOIs is challenging but desirable for many applications.

Purpose of the Study:

  • To theoretically investigate and design high-performance, transmission-type one-dimensional MPCs for flat-top MOIs.
  • To demonstrate the tunability of MOI characteristics by adjusting the applied magnetic field.
  • To assess the feasibility of compensating for fabrication errors through magnetic field tuning.

Main Methods:

  • Theoretical modeling of one-dimensional magnetophotonic crystal structures.
  • Simulation of optical transmission spectra under varying magnetic field strengths.
  • Analysis of spectral width, isolation performance, and thickness of the designed MOIs.

Main Results:

  • Introduction of novel MPC structures enabling flat-top spectral responses.
  • Demonstration of perfect MOI characteristics achievable by tuning the magnetic field.
  • Achieved a 19.42 μm-thick perfect MOI with a 7.2 nm flat-top width in the optimal case.
  • Investigated and confirmed the possibility of compensating layer thickness errors via magnetic adjustment.

Conclusions:

  • The proposed MPC structures are suitable for constructing thin, high-performance flat-top MOIs.
  • Magnetic field tuning provides an effective method for achieving perfect isolation and compensating for fabrication imperfections.
  • These findings pave the way for practical applications of tunable MOIs in various optical systems.