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Nonlinear spectrum reshaping and gap-soliton-train trapping in optically induced photonic structures
Cibo Lou1, Xiaosheng Wang, Jingjun Xu
1The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physical School, Nankai University, Tianjin 300457, China.
Physical Review Letters
|August 7, 2007
Summary
We demonstrate gap soliton trains in photonic lattices, observing nonlinear transport and spectrum reshaping. Energy transfers to unexcited regions, advancing nonlinear optics and photonic lattice research.
Area of Science:
- Nonlinear optics
- Photonic lattices
- Soliton physics
Background:
- Photonic lattices are crucial for controlling light propagation.
- Gap solitons are localized nonlinear waves in periodic structures.
- Nonlinear transport phenomena are key to understanding energy dynamics.
Purpose of the Study:
- To theoretically predict and experimentally demonstrate gap soliton trains.
- To investigate the evolution of stripe beams in self-defocusing photonic lattices.
- To explore nonlinear transport and spectrum reshaping mechanisms.
Main Methods:
- Theoretical modeling of nonlinear k-space evolution.
- Experimental demonstration using a self-defocusing photonic lattice.
- Analysis of spatial power spectrum evolution and energy transfer.
Main Results:
- First observation of gap soliton trains without prior spectral or phase engineering.
- Stripe beams evolved into gap soliton trains with power spectrum growth in orthogonal directions.
- Demonstration of nonlinear transport and spectrum reshaping.
Conclusions:
- Energy can transfer between normal and anomalous diffraction regions.
- Energy transfer occurs from initially excited to unexcited regions in nonlinear k-space.
- This work opens new avenues for controlling light in photonic devices.
