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Related Concept Videos

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:
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
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...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

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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Updated: Jun 19, 2026

Characterization of Anisotropic Leaky Mode Modulators for Holovideo
09:36

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Published on: March 19, 2016

Semileaky waves in dielectric chirowaveguides.

C R Paiva, A L Topa, A M Barbosa

    Optics Letters
    |October 3, 2009
    PubMed
    Summary

    Semileaky waves in dielectric chirowaveguides are explored. Properly chosen chirality parameters enable chiral thin-film slabguides to support semileaky modes, radiating energy into the substrate.

    Area of Science:

    • Electromagnetism
    • Optics
    • Materials Science

    Background:

    • Dielectric chirowaveguides offer unique electromagnetic properties.
    • Understanding wave propagation in chiral media is crucial for advanced photonic devices.

    Purpose of the Study:

    • To investigate the occurrence and characteristics of semileaky waves in dielectric chirowaveguides.
    • To determine the conditions under which semileaky modes can be supported.

    Main Methods:

    • Theoretical analysis of wave propagation in chiral thin-film slab structures.
    • Mathematical modeling of electromagnetic fields within the chirowaveguide.

    Main Results:

    • Demonstration that a specific thin-film dielectric chiroslabguide configuration can support semileaky modes.

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  • Identification of the role of chirality parameters in enabling energy radiation into the substrate.

    • Conclusions:

    • The study confirms the existence of semileaky modes in dielectric chirowaveguides.
    • Proper selection of chirality parameters is essential for controlling wave behavior and energy leakage in chiral photonic structures.