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Controlling the effective second-order susceptibility in random quadratic media
Optics Express
|February 3, 2016
Summary
Spatial disorder in ferroelectric domains impacts optical frequency conversion polarization. Researchers controlled domain statistics to analyze nonlinear susceptibility, revealing how domain structure affects harmonic signal polarization.
Area of Science:
- Nonlinear optics
- Condensed matter physics
- Materials science
Background:
- Ferroelectric domains in nonlinear optical media are crucial for frequency conversion.
- Spatial disorder in these domains can significantly alter optical properties.
- Understanding this disorder is key to optimizing nonlinear optical processes.
Purpose of the Study:
- To systematically investigate the impact of ferroelectric domain spatial disorder on optical frequency conversion polarization.
- To analyze how different domain size statistics influence the polarization of second- and third-harmonic signals.
- To correlate nonlinear susceptibility tensor components (d24, d32, d33) with domain structure and polarization evolution.
Main Methods:
- Creation of ferroelectric domain structures with varying statistics using electric field poling at room temperature.
- Experimental analysis of polarization properties for second-harmonic generation (SHG) and third-harmonic generation (THG) signals.
- Determination of the relative strengths of non-zero components of the second-order nonlinear susceptibility tensor (d24, d32, d33).
Main Results:
- The spatial disorder of ferroelectric domains demonstrably affects the polarization characteristics of optical frequency conversion.
- Specific statistics of domain sizes lead to distinct evolutions in the polarization of second- and third-harmonic signals.
- The relative strengths of nonlinear susceptibility components (d24, d32, d33) were successfully correlated with the control parameter E on the P-E loop, indicating a link between domain structure and nonlinear optical response.
Conclusions:
- Spatial disorder in ferroelectric domains is a critical factor influencing polarization in optical frequency conversion.
- Tailoring domain statistics offers a method to control and optimize the polarization properties of generated harmonic signals.
- The findings provide a deeper understanding of the relationship between ferroelectric domain structure and nonlinear optical phenomena.
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