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Related Concept Videos

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Energy Losses in Transformers01:21

Energy Losses in Transformers

In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
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Metal-Semiconductor Junctions01:24

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Schottky Barriers
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Types of Reversible Electrodes01:24

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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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Equivalent Circuits for Practical Transformers

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Electrically switchable metallic polymer nanoantennas.

Julian Karst1, Moritz Floess1, Monika Ubl1

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Science (New York, N.Y.)
|October 28, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed switchable plasmonic nanoantennas using metallic polymers. These devices enable electrical control of light-matter interactions for advanced optical applications.

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Area of Science:

  • Plasmonics
  • Materials Science
  • Optoelectronics

Background:

  • Integrated electro-optically active plasmonics require electrical switching of metal-to-insulator transitions.
  • Plasmonic nanoantennas are crucial components in manipulating light at the nanoscale.

Purpose of the Study:

  • To realize plasmonic nanoantennas from metallic polymers capable of electrical switching.
  • To demonstrate electrically switchable beam-steering metasurfaces with high contrast ratios.

Main Methods:

  • Fabrication of plasmonic nanoantennas using metallic polymers.
  • Electrochemical driving of the optical metal-to-insulator transition.
  • Characterization of localized plasmon resonances and their switching behavior.

Main Results:

  • Plasmonic nanoantennas exhibited well-pronounced localized plasmon resonances in their metallic state.
  • Electrical switching of plasmonic resonances (on/off) achieved at video-rate frequencies (up to 30 Hz) with ±1 volt.
  • Demonstrated electrically switchable beam-steering metasurfaces with 100% transmission contrast ratio.

Conclusions:

  • Metallic polymer-based plasmonic nanoantennas enable efficient electrical switching of optical properties.
  • This approach facilitates the development of ultrahigh efficiency plasmonic-based active optical devices.
  • Potential applications include high-resolution augmented and virtual reality technologies.