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Related Concept Videos

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.
The EM field is assumed to be a...
Electromagnetic Wave Equation01:24

Electromagnetic Wave Equation

Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations: What...
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:
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

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 II01:29

Plane Electromagnetic Waves II

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.
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Two-dimensional optics with surface electromagnetic waves.

R J Bell, C A Goben, M Davarpanah

    Applied Optics
    |February 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Surface electromagnetic waves (SEW) exhibit two-dimensional optical effects on metals. These principles are applicable to optics, demonstrating negligible metal substrate losses for SEW propagation.

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    Area of Science:

    • Physics
    • Optics
    • Electromagnetism

    Background:

    • Surface electromagnetic waves (SEW) are crucial for understanding wave propagation at interfaces.
    • Previous studies have explored SEW properties, but two-dimensional optical phenomena require further investigation.

    Purpose of the Study:

    • To experimentally demonstrate two-dimensional optical effects using surface electromagnetic waves (SEW) on metals.
    • To validate fundamental optical laws (Snell's Law, law of reflection) for SEW.
    • To explore the potential of SEW for optical applications.

    Main Methods:

    • Experiments conducted at microwave frequencies (lambda = 3.55 cm) using metal surfaces.
    • Utilized prisms and lenses to study refractive and reflective properties of SEW.
    • Fabricated a two-dimensional SEW grating to observe diffraction.

    Main Results:

    • Snell's law of refraction and the law of reflection were experimentally verified for SEW.
    • Radiative losses were found to be minimal, and Fresnel's equations accurately described SEW reflectivity.
    • First-order diffraction was observed from a two-dimensional SEW grating.

    Conclusions:

    • Two-dimensional SEW optics are feasible and applicable from microwave frequencies to the near-infrared spectrum.
    • SEW propagation in overlayer materials is largely unaffected by the metal substrate, indicating negligible losses.
    • The findings support the potential for developing novel optical devices based on SEW.