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Videos de Conceptos Relacionados

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.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the copper windings...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

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...
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The winding...

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Nanoantenas de polímeros metálicos con capacidad de conmutación eléctrica

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
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nanoantenas plasmónicas conmutables utilizando polímeros metálicos. Estos dispositivos permiten el control eléctrico de las interacciones luz-materia para aplicaciones ópticas avanzadas.

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Área de la Ciencia:

  • Las plasmónicas
  • Ciencias de los materiales
  • Optoelectrónica y sus derivados

Sus antecedentes:

  • Las plasmónicas electro-ópticas activas integradas requieren la conmutación eléctrica de las transiciones de metal a aislante.
  • Las nanoantenas plasmónicas son componentes cruciales para manipular la luz a nanoescala.

Objetivo del estudio:

  • Realizar nanoantenas plasmónicas a partir de polímeros metálicos con capacidad de conmutación eléctrica.
  • Demostrar las metasuperficies de dirección eléctrica con altas relaciones de contraste.

Principales métodos:

  • Fabricación de nanoantenas plasmónicas utilizando polímeros metálicos.
  • La conducción electroquímica de la transición óptica de metal a aislante.
  • Caracterización de las resonancias plasmónicas localizadas y su comportamiento de conmutación.

Principales resultados:

  • Las nanoantenas plasmónicas exhibieron resonancias plasmónicas localizadas bien pronunciadas en su estado metálico.
  • Intercambio eléctrico de resonancias plasmónicas (encendido/apagado) logrado a frecuencias de velocidad de vídeo (hasta 30 Hz) con ±1 voltios.
  • Superficies metálicas de dirección de haz con capacidad de conmutación eléctrica demostrada con una relación de contraste de transmisión del 100%.

Conclusiones:

  • Las nanoantenas plasmónicas basadas en polímeros metálicos permiten una conmutación eléctrica eficiente de las propiedades ópticas.
  • Este enfoque facilita el desarrollo de dispositivos ópticos activos basados en plasmónicos de ultraalta eficiencia.
  • Las aplicaciones potenciales incluyen tecnologías de realidad aumentada y virtual de alta resolución.