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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

Twisting light by nonlinear photonic crystals.

Noa Voloch Bloch1, Keren Shemer, Asia Shapira

  • 1Department of Physical Electronics, Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel. noavoloch@gmail.com

Physical Review Letters
|September 26, 2012
PubMed
Summary

Researchers observed nonlinear interactions in twisted quadratic nonlinear crystals. These crystals imprint quasi-angular-momentum onto photons, conserving total angular momentum and enabling control over photon properties for applications in quantum entanglement and vortex beam shaping.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Crystallography

Background:

  • Quadratic nonlinear crystals are crucial for frequency conversion.
  • Understanding light-matter interactions in engineered materials is key to novel photonic applications.
  • Photon angular momentum plays a vital role in quantum information processing.

Purpose of the Study:

  • To investigate nonlinear optical interactions in quadratic nonlinear crystals with geometrically twisted susceptibility patterns.
  • To explore the imprinting of quasi-angular-momentum onto photons during nonlinear processes.
  • To demonstrate the generation and control of second-order harmonic vortex beams.

Main Methods:

  • Utilizing quadratic nonlinear crystals with specifically designed twisted susceptibility.
  • Employing a Gaussian pump beam to generate second-order harmonic vortex beams.
  • Analyzing the conservation of total angular momentum during the nonlinear interaction.

Main Results:

  • Observed nonlinear interactions where quasi-angular-momentum is imprinted on photons.
  • Demonstrated conservation of total angular momentum in the nonlinear process.
  • Successfully generated second-order harmonic vortex beams from a Gaussian pump beam.

Conclusions:

  • Geometrically twisted nonlinear crystals offer a novel pathway to control photon properties.
  • These crystals enable the manipulation of photon energy, translational momentum, and angular momentum.
  • Potential applications include generating multidimensional photon entanglement and shaping vortex beam structures and polarization.