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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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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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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Topological phononic metamaterials.

Weiwei Zhu1,2, Weiyin Deng3, Yang Liu4

  • 1Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)
|September 14, 2023
PubMed
Summary
This summary is machine-generated.

Topological phononic metamaterials harness unique band structures for robust, novel phenomena. This review covers theoretical and experimental advances, including topological lasers and exotic phases, in this rapidly evolving field.

Keywords:
acousticsmetamaterialsphononstopological materialstopological phenomenatopological physics

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Area of Science:

  • Physics
  • Materials Science
  • Metamaterials

Background:

  • Topological concepts in condensed matter yield robust phenomena.
  • This paradigm is now extended to phononic metamaterials, enabling new physics.
  • Phononic metamaterials offer exceptional control and tunability.

Purpose of the Study:

  • To review the theoretical and experimental progress in topological phononic metamaterials.
  • To highlight the underlying physics principles driving these advancements.
  • To provide a broad overview of the field, including emerging topics and applications.

Main Methods:

  • Review of existing theoretical frameworks for topological phononics.
  • Analysis of experimental demonstrations and fabrication techniques.
  • Discussion of advanced concepts like non-Hermitian effects and synthetic dimensions.

Main Results:

  • Discovery of phenomena like topological negative refraction and topological 'sasers'.
  • Observation of higher-order topological insulating and Weyl semimetal states.
  • Exploration of Majorana-like modes and fragile topological phases.

Conclusions:

  • Topological phononic metamaterials offer a rich platform for fundamental physics and novel applications.
  • The field is rapidly advancing with synergy between theory, experiment, and emerging concepts.
  • Future directions include exploring active matter, advanced fabrication, and broader impacts on science.