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Dislocation parity effects in crystals with quadratic nonlinear response.

Shani Sharabi1, Noa Voloch-Bloch1, Irit Juwiler2

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Summary
This summary is machine-generated.

The parity of topological charge in nonlinear photonic crystals controls energy transfer. Odd charges shift optimal wavelengths, while even charges have minimal impact on efficiency.

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Photonics

Background:

  • Quadratic nonlinear photonic crystals are crucial for frequency conversion.
  • Phase matching dictates the efficiency of nonlinear optical processes.
  • Topological dislocations introduce unique properties to optical materials.

Purpose of the Study:

  • To investigate the influence of edge topological dislocations on phase matching in nonlinear photonic crystals.
  • To understand how the topological charge parity affects energy transfer between fundamental and second harmonic waves.

Main Methods:

  • Theoretical modeling of light propagation in photonic crystals with dislocations.
  • Experimental verification using periodically poled, phase-reversed, and quasiperiodic nonlinear photonic crystals.

Main Results:

  • The parity of the dislocation's topological charge dictates energy transfer efficiency.
  • Odd topological charges null efficiency at optimal wavelengths but enhance it at new wavelengths.
  • Even topological charges show negligible impact on the efficiency spectrum.
  • Dislocations imprint spectral "dimples" on efficiency peaks in various crystal types.

Conclusions:

  • Topological dislocations offer a novel method to control wavelength conversion in nonlinear photonic crystals.
  • The parity-dependent effect provides a tunable mechanism for optimizing harmonic generation.
  • This research opens avenues for designing advanced photonic devices with tailored nonlinear responses.