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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:
Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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 phenomenon...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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.
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Related Experiment Video

Updated: May 30, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Phonon-plasmon coupled modes in GaN.

A Dyson1

  • 1Department of Physics, University of Hull, Hull HU6 7RX, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 10, 2011
PubMed
Summary

Phonon lifetimes in Gallium Nitride (GaN) depend on electron density and temperature due to anharmonic interactions. This study models these effects, revealing key insights into phonon behavior in GaN.

Area of Science:

  • Solid State Physics
  • Materials Science
  • Semiconductor Physics

Background:

  • Phonon lifetime in Gallium Nitride (GaN) is known to be influenced by electron density.
  • Recent noise measurements indicate a temperature dependence of the phonon lifetime.

Purpose of the Study:

  • To investigate the underlying mechanisms causing the electron density and temperature dependence of phonon lifetimes in GaN.
  • To model the coupled phonon-plasmon dynamics and their impact on phonon relaxation.

Main Methods:

  • Analysis of phonon-plasmon coupling through the dielectric function.
  • Comparison of coupled-mode momentum relaxation rates with existing models (Callen).
  • Development of a simplified model incorporating anharmonic interactions and phonon migration.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Related Experiment Videos

Last Updated: May 30, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Main Results:

  • The study confirms that the coupling of phonon and plasmon populations is the source of observed dependences.
  • A model including anharmonicity and phonon migration successfully predicts phonon lifetimes dependent on both electron density and temperature.
  • The frequency and wavevector dependent coupled-mode momentum relaxation rate is analyzed.

Conclusions:

  • Anharmonic interactions and phonon migration are critical factors determining phonon lifetimes in GaN.
  • The developed model provides a framework for understanding and predicting phonon behavior under varying electron densities and temperatures.
  • This work contributes to a deeper understanding of thermal transport in GaN.