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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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Sound Waves: Resonance01:14

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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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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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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.
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Related Experiment Video

Updated: May 1, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Resonant pulling of a microparticle using a backward surface wave.

A V Maslov1

  • 1University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia.

Physical Review Letters
|April 8, 2014
PubMed
Summary

Optical forces on dielectric particles can oppose surface wave power flow when using backward waves. This phenomenon, linked to electromagnetic momentum, has implications for photonic circuits and optofluidics.

Area of Science:

  • * Electromagnetics and Optics
  • * Nanophotonics and Plasmonics

Background:

  • * Surface waves enable light confinement and manipulation at the nanoscale.
  • * Understanding optical forces is crucial for designing optical devices.

Purpose of the Study:

  • * To investigate the direction and magnitude of optical forces on dielectric particles excited by surface waves.
  • * To explore the role of backward surface waves in optical force generation.
  • * To assess the potential applications of these forces in photonic and optofluidic systems.

Main Methods:

  • * Theoretical analysis of electromagnetic momentum flow for backward surface waves.
  • * Calculation of optical forces exerted on a resonant dielectric particle.
  • * Simulation of particle-wave interactions.

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Main Results:

  • * Predicted optical forces acting on dielectric particles can be directed opposite to the incident power flow.
  • * The force magnitude is comparable to the surface wave's momentum flow.
  • * This effect is specifically observed when the exciting wave is a backward surface wave.

Conclusions:

  • * Backward surface waves exert unique optical forces on dielectric particles.
  • * These findings enhance the understanding of backward surface wave electromagnetics.
  • * Potential applications include integrated photonic circuits and optofluidic devices.