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Harmonic Nanoparticles for Regenerative Research
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Enhanced Čerenkov second-harmonic emission in nonlinear photonic structures.

K Kalinowski1, P Roedig, Y Sheng

  • 1Laser Physics Center and Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia. xkk124@physics.anu.edu.au

Optics Letters
|June 5, 2012
PubMed
Summary

We enhanced second-harmonic generation power by 270 times in nonlinear photonic crystals. This was achieved by optimizing the angle of incidence to compensate for phase mismatch, enabling nonlinear Bragg diffraction.

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Area of Science:

  • Nonlinear optics
  • Photonics
  • Condensed matter physics

Background:

  • Čerenkov-type second-harmonic generation (SHG) is a key process in nonlinear optics.
  • Controlling phase matching is crucial for efficient SHG.
  • One-dimensional nonlinear photonic crystals offer unique properties for light manipulation.

Purpose of the Study:

  • To experimentally and theoretically investigate Čerenkov-type SHG in a 1D nonlinear photonic crystal.
  • To demonstrate significant enhancement of second-harmonic power.
  • To explore the role of reciprocal lattice vectors in phase-matching and nonlinear interactions.

Main Methods:

  • Experimental setup for Čerenkov-type SHG measurements.
  • Theoretical modeling of nonlinear optical processes in photonic crystals.
  • Varying the angle of incidence of the fundamental beam.
  • Utilizing the reciprocal lattice vector for phase compensation.

Main Results:

  • Achieved a 270-fold enhancement in emitted second-harmonic power.
  • Demonstrated effective phase mismatch compensation in the transverse direction.
  • Operated in the nonlinear Bragg diffraction regime.

Conclusions:

  • The angle of incidence is a critical parameter for optimizing SHG in nonlinear photonic crystals.
  • Reciprocal lattice vector-assisted phase matching enables efficient nonlinear interactions.
  • Nonlinear Bragg diffraction provides a powerful mechanism for enhanced light conversion.