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Related Experiment Videos

Spontaneous Photon Production in Time-Dependent Epsilon-Near-Zero Materials.

A Prain1, S Vezzoli1, N Westerberg1

  • 1Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 7AS Edinburgh, United Kingdom.

Physical Review Letters
|April 15, 2017
PubMed
Summary

Researchers theoretically predict significant photon-pair production in epsilon-near-zero (ENZ) materials due to time-varying refractive index changes. This breakthrough could enable experimental verification of quantum field theory predictions and create new entangled light sources.

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Area of Science:

  • Quantum field theory
  • Condensed matter physics
  • Nonlinear optics

Background:

  • Quantum field theory predicts vacuum photon-pair production in time-varying media.
  • Experimental verification is challenging due to the need for large-amplitude, rapid medium changes.
  • Epsilon-near-zero (ENZ) materials offer large, ultrafast refractive index modulations.

Purpose of the Study:

  • To theoretically investigate photon-pair production in time-varying ENZ materials.
  • To compare emission yields in ENZ versus non-ENZ materials.
  • To explore the spectral characteristics of photon emission.

Main Methods:

  • Quantum field theory analysis of a homogeneous, time-varying ENZ medium.
  • Theoretical modeling of refractive index changes induced by optical means.

Related Experiment Videos

  • Calculation of photon-pair production rates and emission spectra.

    • Main Results:

    • Photon-pair production in ENZ materials is orders of magnitude larger than in non-ENZ materials.
    • Emission spectrum in ENZ materials is peaked at the ENZ wavelength, independent of perturbation timescale.
    • Significant refractive index changes (order of unity) are achievable on femtosecond timescales.

    Conclusions:

    • ENZ materials significantly enhance predicted photon-pair production.
    • This work provides a pathway for experimental observation of vacuum photon emission.
    • Potential applications include new entangled light sources and testing fundamental quantum field theories.