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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

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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...
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Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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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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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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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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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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Updated: May 10, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Topological guided-mode resonances: basic theory, experiments, and applications.

Yu Sung Choi1, Chan Young Park1, Soo-Chan An1

  • 1Department of Physics, Hanyang University, Seoul, 133-791, Korea.

Nanophotonics (Berlin, Germany)
|April 28, 2025
PubMed
Summary
This summary is machine-generated.

Topological guided-mode resonance (GMR) effects offer novel ways to control light in nanophotonic devices. This review explores their fundamental principles, experimental realizations, and applications in topological photonics.

Keywords:
diffraction gratingguided mode resonancesnon-Hermitian Hamiltonianstopological physicswaveguide

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Area of Science:

  • Nanophotonics
  • Topological Photonics
  • Wave Phenomena

Background:

  • Guided-mode resonance (GMR) is fundamental to nanophotonic elements.
  • GMR structures serve as platforms for studying novel wave phenomena.
  • Topological photonics is an emerging field with significant potential.

Purpose of the Study:

  • To review topological GMR effects within the context of topological photonics.
  • To explain basic topological parameters and associated optical properties.
  • To discuss experimental realizations and potential applications of topological GMR.

Main Methods:

  • Conceptual minimal model for explaining topological parameters.
  • Review of recent topics including edge-state resonances and bound states.
  • Analysis of experimental realizations and far-field optical properties.

Main Results:

  • Explanation of basic topological parameters and optical properties.
  • Coverage of recent advancements: edge-state resonances, beam shaping, bound states in the continuum, unidirectional resonances, and polarization vortices.
  • Discussion of experimental implementations and practical applications.

Conclusions:

  • Topological GMR effects represent a promising area in topological photonics.
  • Further research is needed to address limitations and challenges.
  • The field holds potential for advanced nanophotonic device applications.