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Exponentially decaying interaction potential of cavity solitons
Shayesteh Rahmani Anbardan1,2, Cristina Rimoldi3, Reza Kheradmand1
1Photonics Group, RIAPA, University of Tabriz, Tabriz, Iran.
Physical Review. E
|May 20, 2018
Summary
Two cavity solitons in a laser exhibit a long-range attractive force, leading to merging. This interaction, similar to hydrophobic forces, depends exponentially on distance and laser characteristic times.
Area of Science:
- Nonlinear optics
- Laser physics
- Condensed matter physics
Background:
- Vertical cavity surface emitting lasers (VCSELs) support stable light structures called cavity solitons.
- Understanding soliton interactions is crucial for applications in all-optical signal processing and information storage.
Purpose of the Study:
- To investigate the interaction dynamics between two cavity solitons in an optically injected VCSEL.
- To characterize the nature and range of the attractive force between solitons.
- To determine the factors influencing soliton merging time.
Main Methods:
- Numerical simulations of an optically injected VCSEL model.
- Analysis of soliton trajectories and merging events at varying initial distances.
- Correlation of merging times with laser characteristic parameters.
Main Results:
- Observed a significant attractive force between cavity solitons even at distances exceeding their diameters.
- Demonstrated that soliton merging time exhibits exponential dependence on initial separation.
- Established a direct relationship between merging time and characteristic laser timescales (photon and carrier lifetimes).
Conclusions:
- The long-range attraction between cavity solitons suggests an exponentially decaying interaction potential, analogous to hydrophobic interactions.
- The merging dynamics are fundamentally linked to the intrinsic temporal properties of the VCSEL system.
- These findings offer insights into controlling and utilizing soliton interactions in photonic devices.
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