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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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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.
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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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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:
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Updated: Feb 15, 2026

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Manipulación de ondas electromagnéticas en sistemas de guía de ondas-cavidad topológicos controlables magnéticamente

Maolin Liu, Tao Zhou, Zhewei Fan

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    PubMed
    Resumen

    Este estudio presenta una plataforma controlable por campo magnético para cristales fotónicos topológicos, que permite el control dinámico de la manipulación de ondas electromagnéticas para filtros sintonizables y efectos similares a la transparencia inducida electromagnéticamente.

    Palabras clave:
    fotónicacristales fotónicos topológicosondas electromagnéticascavidad-guía de ondasefecto similar a EITfiltro sintonizablecampo magnético

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    Área de la Ciencia:

    • Fotónica
    • Física de la Materia Condensada
    • Electromagnetismo

    Sus antecedentes:

    • Los cristales fotónicos topológicos (TPhcs) ofrecen un control avanzado de las ondas electromagnéticas (EM) a través de estados de borde (ES) y estados de esquina (CS) topológicos.
    • Los sistemas TPhcs existentes, como los sistemas topológicos de cavidad-guía de ondas, tienen funciones fijas, lo que limita las aplicaciones prácticas en fotónica integrada.

    Objetivo del estudio:

    • Proponer y demostrar una plataforma controlable por campo magnético para la modulación dinámica de la transmisión de ondas EM en TPhcs.
    • Desarrollar un sistema topológico de cavidad-guía de ondas sintonizable para aplicaciones versátiles de dispositivos fotónicos.

    Principales métodos:

    • Acoplamiento de una cavidad cúbica superficial (TCS) topológica sintonizable por campo magnético con una guía de ondas de estado de borde (ES).
    • Investigación de la manipulación de los comportamientos de transmisión de ondas EM a través del ajuste del campo magnético.

    Principales resultados:

    • Se demostró una función de filtro sintonizable y topológicamente protegida en el sistema propuesto.
    • Se logró un fenómeno sintonizable similar a la transparencia inducida electromagnéticamente (EIT-like) controlando el campo magnético.
    • Se mostró la modulación dinámica de la transmisión de ondas EM en un sistema topológico de cavidad-guía de ondas.

    Conclusiones:

    • La plataforma controlable por campo magnético permite el control dinámico de las ondas EM en TPhcs.
    • Este enfoque facilita el diseño de dispositivos fotónicos multifuncionales y sistemas variables en el tiempo.
    • El control dinámico robusto en sistemas topológicos de cavidad-guía de ondas abre nuevas vías para la fotónica integrada.