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Acoustic Purcell Effect for Enhanced Emission.

Maryam Landi1, Jiajun Zhao2,3, Wayne E Prather1

  • 1National Center for Physical Acoustics and Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA.

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|March 31, 2018
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This summary is machine-generated.

Researchers found that the enhanced sound emission from a speaker in a metacavity matches calculations of the density of states (DOS). This work links acoustic DOS to the acoustic Purcell effect for improved sound emission.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Quantum Optics Analogs

Background:

  • Metacavities can enhance sound emission.
  • The density of states (DOS) describes available energy states in a system.
  • The Purcell effect describes enhanced emission rates in resonant systems.

Purpose of the Study:

  • To experimentally verify the relationship between enhanced sound emission and the acoustic density of states (DOS) in a metacavity.
  • To formulate a theoretical link between emitted sound power and acoustic DOS.
  • To connect acoustic DOS and the acoustic Purcell effect for sound emission enhancement.

Main Methods:

  • Experimental measurement of sound emission power from a speaker in a metacavity.
  • Numerical calculation of the density of states (DOS) for the source-cavity system.
  • Formulation of a theoretical model relating emitted power to acoustic DOS, analogous to Fermi's golden rule.

Main Results:

  • Experimental emission power enhancement agrees with numerically calculated DOS enhancement.
  • A novel formulation connects emitted sound power to acoustic DOS.
  • The formulation complements traditional radiation impedance theory.

Conclusions:

  • The study validates the role of acoustic DOS in sound emission enhancement within metacavities.
  • A new theoretical framework bridges acoustic DOS and the acoustic Purcell effect.
  • This work provides a foundation for understanding and controlling sound emission using metamaterials.