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Light bullets in Bessel optical lattices with spatially modulated nonlinearity
Fangwei Ye1, Yaroslav V Kartashov, Bambi Hu
1Department of Physics, Centre for Nonlinear Studies, and The Beijing-Hong Kong Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Hong Kong Baptist University, Kowloon Tong, China. Fwye@hkbu.edu.hk
Optics Express
|July 8, 2009
Summary
Spatial modulation of nonlinearity in Bessel optical lattices stabilizes light bullets. Varying modulation depth controls stability and increases maximum energy for these stable optical structures.
Area of Science:
- Nonlinear optics
- Optical physics
- Photonics
Background:
- Light bullets are self-trapped light beams that can propagate without diffraction.
- Bessel optical lattices offer a unique environment for studying light bullet dynamics.
- Modulation of refractive indices can influence optical beam propagation and stability.
Purpose of the Study:
- To investigate the stability of light bullets in Bessel optical lattices with out-of-phase modulation of refractive indices.
- To understand how spatial modulation of nonlinearity affects light bullet properties and stability domains.
- To determine the influence of nonlinearity modulation depth on the stability and energy of light bullets.
Main Methods:
- Numerical simulations were employed to analyze the propagation dynamics of light bullets.
- The study focused on Bessel optical lattices with spatially modulated linear and nonlinear refractive indices.
- Stability analysis was performed by examining the behavior of light bullets under varying parameters.
Main Results:
- Spatial modulation of nonlinearity significantly alters light bullet shapes and stability regions.
- Light bullets can achieve stable propagation if their peak intensity remains below a critical threshold.
- The width of the stability domain is tunable via the nonlinearity modulation depth.
- Maximum energy of stable light bullets increases with enhanced nonlinearity modulation.
Conclusions:
- Out-of-phase modulation of refractive indices in Bessel optical lattices provides a mechanism to control light bullet stability.
- Nonlinearity modulation depth is a key parameter for tailoring the energy and stability of light bullets.
- These findings offer potential for designing and controlling robust optical structures in nonlinear media.
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