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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
Differential Form of Maxwell's Equations01:17

Differential Form of Maxwell's Equations

James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having combined existing knowledge of the laws of electricity and the laws of magnetism with his insights to form a complete overarching electromagnetic theory, represented by Maxwell's equations. The four basic laws of electricity and magnetism were discovered experimentally through the work of physicists such as Oersted, Coulomb, Gauss, and Faraday.
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Energy Associated With a Charge Distribution01:21

Energy Associated With a Charge Distribution

The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.

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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
09:19

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Published on: July 29, 2013

Electrodinámica cuántica de cavidad con modos localizados por Anderson.

Luca Sapienza1, Henri Thyrrestrup, Søren Stobbe

  • 1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800 Kgs. Lyngby, Denmark. lucs@fotonik.dtu.dk

Science (New York, N.Y.)
|March 13, 2010
PubMed
Resumen

Los investigadores utilizaron el desorden en los cristales fotónicos para impulsar las interacciones luz-materia para las tecnologías cuánticas. Este enfoque mejora la emisión y el acoplamiento de fotones individuales, creando dispositivos cuánticos robustos.

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Área de la Ciencia:

  • La óptica cuántica es una óptica cuántica.
  • Tecnología de la información cuántica Tecnología de la información cuántica.
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • Mejorar las interacciones luz-materia es crucial para las tecnologías cuánticas.
  • Las cavidades ópticas tradicionales son sensibles a las imperfecciones de fabricación.

Objetivo del estudio:

  • Explorar el uso del desorden como un recurso para la mejora de la interacción luz-materia.
  • Desarrollar una plataforma robusta para dispositivos de información cuántica.

Principales métodos:

  • Introdujo deliberadamente el desorden en las guías de onda de cristal fotónico.
  • Generó modos de cavidad localizados por Anderson.
  • Los puntos cuánticos de semiconductores incorporados actúan como emisores cuánticos.

Principales resultados:

  • Logró una mejora de 15 veces en la tasa de emisión de puntos cuánticos.
  • Se demostró una eficiencia de acoplamiento del 94% de fotones individuales a modos localizados por Anderson.
  • Mostró el potencial de los medios fotónicos desordenados para aplicaciones cuánticas.

Conclusiones:

  • El desorden puede ser aprovechado como un recurso en los sistemas fotónicos.
  • La localización de Anderson en cristales fotónicos proporciona una plataforma eficiente para la electrodinámica cuántica.
  • Este método ofrece un camino hacia dispositivos de información cuántica robustos para el desorden.