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Currents and flux-inversion in photokinetic active particles
Claudio Maggi1, Luca Angelani, Giacomo Frangipane
1NANOTEC-CNR, Institute of Nanotechnology, Soft and Living Matter Laboratory, Piazzale A. Moro 2, I-00185, Roma, Italy. claudio.maggi@roma1.infn.it.
Soft Matter
|June 1, 2018
Summary
We explored controlling active particle movement using traveling light patterns. Our findings provide general formulas for particle current, enabling efficient light-based reconfiguration of colloids and bacteria.
Area of Science:
- Physics of active matter
- Soft matter physics
- Colloidal science
Background:
- Active particles exhibit light-controlled propulsion (photokinesis).
- Directed transport is crucial for manipulating microscale systems.
- Understanding photokinesis is key for advanced material design.
Purpose of the Study:
- Investigate directed transport of photokinetic particles using traveling light patterns.
- Develop general expressions for particle current under different light wave speeds.
- Provide an exact solution for the "run and tumble" model.
Main Methods:
- Theoretical analysis of active particle dynamics.
- Derivation of general expressions for particle current.
- Exact solution for the one-dimensional "run and tumble" model.
Main Results:
- General formulas for particle current in slow and fast light wave shift regimes.
- Asymptotic formulas are independent of light wave shape.
- Exact solution derived for the "run and tumble" model.
Conclusions:
- Developed theoretical framework for light-controlled particle transport.
- Results applicable to diverse active particle models.
- Potential for designing illumination patterns for efficient spatial reconfiguration of micro- and nanostructures.
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