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Optically tunable superprism effect in nonlinear photonic crystals.

Nicolae C Panoiu1, Mayank Bahl, Richard M Osgood

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA. panoiu@cumsl.msl.columbia.edu

Optics Letters
|December 24, 2003
PubMed
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Researchers tuned light refraction angles in nonlinear photonic crystals using a pump beam. This tunable superprism effect is more efficient near a bandgap edge, requiring less optical power.

Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Photonics

Background:

  • Photonic crystals offer unique light manipulation properties.
  • The superprism effect allows for large angular dispersion of light.
  • Nonlinear optical effects can dynamically alter photonic properties.

Purpose of the Study:

  • To analyze the tunable superprism effect in a 2D nonlinear photonic crystal.
  • To investigate the influence of nonlinear effects on light refraction angles.
  • To identify conditions for reduced optical power requirements.

Main Methods:

  • Theoretical analysis of photonic band structure shifts.
  • Utilizing the Kerr effect induced by a pump beam.
  • Simulating the tuning of refraction angles for a signal beam.

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Main Results:

  • Demonstrated tuning of the signal beam's refraction angle over tens of degrees.
  • Showcased dynamic control of the superprism effect via nonlinear band shifting.
  • Identified significant reduction in required optical power near bandgap edges.

Conclusions:

  • The nonlinear photonic crystal enables tunable light steering.
  • The Kerr effect provides a mechanism for dynamic superprism control.
  • Operating near bandgap edges enhances energy efficiency for tuning.