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Faraday's Law01:10

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Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Electrically controlled multifrequency ferroelectric cloak.

Peining Li1, Youwen Liu, Yunji Meng

  • 1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Optics Express
|July 1, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel electrically controlled multifrequency cloak using ferroelectric material. This tunable cloak reduces scattering across multiple frequencies, offering significant design flexibility for advanced cloaking applications.

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Area of Science:

  • Electromagnetic theory
  • Materials science
  • Metamaterials

Background:

  • Metamaterial cloaking aims to render objects invisible by controlling electromagnetic wave propagation.
  • Existing cloaks often operate at a single frequency or lack tunability.
  • Ferroelectric materials offer tunable dielectric properties, crucial for adaptive electromagnetic responses.

Purpose of the Study:

  • To propose and theoretically validate a novel electrically controlled multifrequency cloak.
  • To demonstrate the cloak's ability to reduce scattering at multiple frequencies.
  • To explore the tunability of cloaking frequencies via external electric fields.

Main Methods:

  • Theoretical analysis of electromagnetic wave interaction with a ferroelectric shell.
  • Numerical simulations to verify cloaking performance and scattering reduction.
  • Investigation of the influence of applied electric fields on ferroelectric properties.

Main Results:

  • The proposed cloak effectively reduces the total scattering cross section at multiple frequencies.
  • High-index ferroelectrics enable significant scattering reduction.
  • Cloaking frequencies are tunable by adjusting the applied electric field.

Conclusions:

  • An electrically controlled multifrequency cloak using a single ferroelectric shell is demonstrated.
  • The cloak offers tunable multifrequency cloaking capabilities with considerable flexibility.
  • This work presents a potential pathway for designing advanced, adaptable cloaking devices.