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Light-regulated soliton dynamics in liquid crystals.

Ke-Hui Wu1, Li-Ting Zhu1, Fang-Fang Xiao1

  • 1Department of Electronic Engineering, School of Electronic Science and Engineering, Xiamen University, Xiamen, China.

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|August 22, 2024
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Researchers developed a new optoelectronic method to control electrically powered solitons in nematics. This technique uses digital light projection for precise patterning, enabling programmable control over soliton generation, motion, and collective behavior.

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Area of Science:

  • Soft Matter Physics
  • Nonlinear Dynamics
  • Optoelectronics

Background:

  • Electrically powered solitons are particle-like excitations in out-of-equilibrium nematic materials.
  • Previous limitations included random generation and lack of controllable motion, hindering practical applications.
  • Nematic solitons offer potential for novel functionalities but require precise manipulation.

Purpose of the Study:

  • To develop a reconfigurable optoelectronic approach for precise control over the entire lifecycle of solitons.
  • To enable programmable generation, motion control, and collective behavior of solitons in nematics.
  • To overcome the limitations of random generation and uncontrollable motion in nematic solitons.

Main Methods:

  • Utilized multi-strategy digital light projection to create patterned virtual electrodes.
  • Employed optically actuated domains with diverse geometries for soliton generation and in-situ formation.
  • Engineered light intensity patterns to modulate soliton velocity and direction, and used light-guided channels for trajectory control.

Main Results:

  • Demonstrated the generation of multiple solitons and in-situ formation of individual solitons via tailored light patterns.
  • Achieved precise control over soliton velocity, propagation direction, and trajectories along customized paths.
  • Showcased dynamic control of collective soliton motion, including migration, mimicking biological phototaxis.

Conclusions:

  • The reconfigurable optoelectronic strategy effectively directs soliton dynamics through the photoconductive effect.
  • This approach enables versatile and programmable control over nematic solitons.
  • The findings present significant advantages for multitasking scenarios and future applications of solitons.