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Second-harmonic imaging from a modulated domain structure.

Yong Zhang1, Fuming Wang, Katrina Geren

  • 1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University,Nanjing 210093, China.

Optics Letters
|January 19, 2010
PubMed
Summary

We developed a new second-harmonic imaging method to visualize ferroelectric domains in nonlinear photonic crystals. This technique precisely maps domain structures and their nonlinear optical properties.

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Area of Science:

  • Nonlinear Optics
  • Materials Science
  • Crystallography

Background:

  • Hexagonally poled lithium tantalate (LiTaO3) is a key material for nonlinear photonic devices.
  • Understanding and characterizing ferroelectric domain structures is crucial for device performance.
  • Existing imaging techniques may lack the resolution or specificity for complex domain inversions.

Purpose of the Study:

  • To introduce and validate a novel second-harmonic (SH) imaging technique for studying domain structures in LiTaO3.
  • To demonstrate the capability of SH imaging in characterizing 180-degree ferroelectric domain inversions.
  • To selectively determine the contributions of different nonlinear tensor components within the domain structure.

Main Methods:

  • Utilizing a femtosecond laser for high-resolution excitation.
  • Employing second-harmonic (SH) generation as the imaging contrast mechanism.
  • Acquiring SH images at varying focal planes to reconstruct domain distribution.

Main Results:

  • Successfully visualized the distribution of 180-degree inverted ferroelectric domains in hexagonally poled LiTaO3.
  • Demonstrated selective determination of nonlinear tensor component contributions based on SH signal modulation.
  • Provided fundamental insights into the relationship between domain structure and nonlinear optical properties.

Conclusions:

  • The developed SH imaging technique offers a powerful tool for characterizing complex ferroelectric domain structures.
  • This method enables a deeper understanding of nonlinear optical phenomena in poled crystals.
  • Potential applications include advanced characterization of photonic crystals and device optimization.