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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Plane Electromagnetic Waves I01:30

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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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Plane Electromagnetic Waves II01:29

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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 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.
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Photonic Weyl Waveguide and Saddle-Chips-like Modes.

Hanyu Wang1,2,3, Wei Xu1,2,3, Zhihong Zhu1,2,3

  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.

Nanomaterials (Basel, Switzerland)
|April 12, 2024
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Summary

Researchers explored coupled Fermi arcs in topological Weyl semimetals, revealing a novel Weyl planar waveguide. This new waveguide exhibits unique hybridized guiding modes with position-dependent propagation, paving the way for advanced photonic devices.

Keywords:
Weyl meta-crystalWeyl waveguideelectromagnetic lidshybridized waveguide modeideal Weyl metamaterialsaddle-chips-like modes

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Photonics

Background:

  • Topological Weyl semimetals feature open Fermi arcs on terminal surfaces, enabling phenomena like one-way propagation.
  • Previous research assumed separated Fermi arcs, overlooking their potential interactions.
  • The coupling between Fermi arcs was not previously considered in waveguide designs.

Purpose of the Study:

  • To investigate the interaction of coupled Fermi arcs in topological Weyl semimetals.
  • To propose and analyze a novel Weyl planar waveguide structure.
  • To explore the unique properties of hybridized guiding modes within this waveguide.

Main Methods:

  • Theoretical modeling of coupled Fermi arcs and hybridized guiding modes.
  • Analysis of z-position-dependent contributions of surface and bulk modes.
  • Experimental fabrication of a Weyl meta-crystal waveguide using periodic holes in metal plates.

Main Results:

  • A saddle-chips-like hybridized guiding mode was discovered in the Weyl planar waveguide.
  • The hybridized modes comprise surface waves and bulk modes with z-position-dependent contributions.
  • Demonstrated strong selectivity in propagation direction for the topological guiding modes.
  • Observed distinct changes in horizontal and vertical propagation components with probe plane shifts.

Conclusions:

  • The proposed Weyl planar waveguide offers a new platform for manipulating light propagation.
  • These topological waveguides enable exotic phenomena and could be used for beam manipulation, position sensing, and 3D information processing.
  • The study provides insights into the coupling and interaction between surface and bulk states in topological materials.