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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:
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...
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Published on: December 27, 2012

Resonance-induced wave penetration through electromagnetic opaque object.

He Wen, Bo Hou, Yang Leng

    Optics Express
    |June 6, 2009
    PubMed
    Summary

    This study reports enhanced electromagnetic wave transmission through opaque metallic meshes using two novel configurations. These designs leverage local resonances for wave penetration, enabling new possibilities in metamaterial applications.

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    Area of Science:

    • Electromagnetism
    • Materials Science
    • Nanotechnology

    Background:

    • Opaque objects typically block electromagnetic wave transmission.
    • Controlling wave propagation through subwavelength structures is a key challenge in optics and electromagnetism.

    Purpose of the Study:

    • To demonstrate and investigate enhanced electromagnetic wave transmission through opaque metallic meshes.
    • To explore two distinct configurations for achieving this enhanced transmission.

    Main Methods:

    • Fabrication of two sample configurations: ABA (metallic mesh between metallic plates with fractal slots) and CBC (metallic mesh between plastic plates with metallic fractals).
    • Experimental measurements of electromagnetic wave transmission.
    • Theoretical simulations to understand the underlying physics.

    Main Results:

    • Both ABA and CBC configurations exhibited multiple transmission peaks, indicating significant wave penetration through the opaque metallic mesh.
    • Transmission enhancement was observed in both configurations.
    • Experimental and theoretical results confirmed the role of local resonances in the sandwiching layers.

    Conclusions:

    • The study successfully demonstrated enhanced electromagnetic wave transmission through opaque metallic meshes.
    • Local resonances within the sandwiching layers are the primary mechanism driving the observed transmission enhancement.
    • The developed configurations offer potential for novel applications in metamaterials and wave manipulation.