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Spontaneous Symmetry Breaking in Diffraction.

J Abad-Arredondo1, Z Geng2, G Keijsers2

  • 1Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), <a href="https://ror.org/01cby8j38">Universidad Autónoma de Madrid</a>, E28049 Madrid, Spain.

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|October 11, 2024
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Summary
This summary is machine-generated.

We observed spontaneous symmetry breaking in laser-driven gratings, leading to asymmetric diffraction. This nonlinear optical effect allows diffracted waves to gain momentum beyond grating limits, opening new possibilities for optical technologies.

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Photonics

Background:

  • Periodic nanostructures, or gratings, are fundamental in optics.
  • Nonlinear optical responses typically mirror the symmetry of the system.
  • Understanding symmetry breaking is key to novel optical phenomena.

Purpose of the Study:

  • To investigate spontaneous symmetry breaking in laser-driven gratings.
  • To explore the nonlinear optical response of gratings with memory.
  • To understand the momentum acquisition of diffracted waves.

Main Methods:

  • Experimental observation of diffraction patterns.
  • Theoretical modeling of nonlinear optical response.
  • Analysis of momentum transfer in diffracted light.

Main Results:

  • Demonstrated asymmetric diffraction from symmetric gratings and illumination.
  • Observed spontaneous symmetry breaking in the nonlinear diffraction regime.
  • Showed diffracted waves acquire momentum parallel to the lattice vector, unconstrained by grating period.

Conclusions:

  • Nonlinear periodic systems exhibit richer diffractive behavior than linear ones.
  • Symmetry breaking in gratings offers new avenues for optical imaging and sensing.
  • Potential applications in information processing using nonlinear photonic systems.