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Observing momentum conservation at temporal interfaces in synthetic frequency dimension.

Yanyan He1, Zhaohui Dong1, Guangzhen Li1

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Scientists explored electromagnetic wave dynamics at temporal interfaces (TIs), revealing momentum conservation during temporal scattering. This study offers a new platform for optical frequency TIs and photon scattering research.

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Area of Science:

  • Physics
  • Optics
  • Wave Phenomena

Background:

  • Electromagnetic wave dynamics differ significantly at temporal interfaces (TIs) compared to spatial interfaces.
  • Understanding temporal scattering relies on momentum conservation principles at TIs.

Purpose of the Study:

  • To experimentally investigate temporal scattering processes of electromagnetic waves at various TIs.
  • To demonstrate momentum conservation across the entire energy band during temporal scattering.
  • To establish a flexible platform for realizing TIs in the optical frequency range.

Main Methods:

  • Construction of synthetic temporal interfaces in the frequency dimension.
  • Study of diverse temporal operation scenarios: band shifting, unfolding/folding, and 2D band variation.
  • Development and application of spectral tomography to retrieve wave function distributions.

Main Results:

  • Experimental demonstration of temporal scattering processes across the whole energy band.
  • Validation of momentum conservation during wave scattering at different TIs.
  • Successful realization of various temporal interface configurations.

Conclusions:

  • The study provides a flexible experimental platform for optical frequency TIs.
  • Fundamental temporal scattering processes for photons can be effectively studied using this platform.
  • Momentum conservation is confirmed as a key principle in temporal wave scattering.