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Movable and Focus-Tunable Lens Based on Electrically Controllable Liquid: A Lattice Boltzmann Study.
Fei Wang1,2, Zijian Zhuang1,2, Zhangrong Qin1,2
1Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China.
Entropy (Basel, Switzerland)
|December 23, 2022
Summary
This study numerically investigates electrowetting-on-dielectrics (EWOD) liquid lenses, finding voltage-controlled zooming from convex to concave. Methods were proposed to accelerate stabilization, improving speed by up to 50%.
Area of Science:
- Physics
- Materials Science
- Optical Engineering
Background:
- Adjusting liquid lens focal length via interface manipulation is a promising technique.
- Electrowetting-on-dielectrics (EWOD) offers a method for tunable liquid lenses.
- Numerical simulations are crucial for understanding complex dynamic processes in liquid lenses.
Purpose of the Study:
- To numerically investigate the zooming process of a movable and focus-tunable EWOD liquid lens.
- To analyze the effect of voltage on lens shape and focal length.
- To explore methods for accelerating lens stabilization in liquids of varying viscosities.
Main Methods:
- Utilizing the lattice-Boltzmann-electrodynamic (LB-ED) method, combining LBM chemical potential and electrodynamic models.
- Solving Navier-Stokes equations with the LB method and Poisson-Boltzmann equation for electric field distribution.
- Comparing simulation results with theoretical predictions from the Lippmann-Young equation.
Main Results:
- Simulations show EWOD-driven liquid lenses transition from convex to concave as voltage increases.
- Focal length change rate varies with voltage, exhibiting different behavior in convex and concave stages.
- Low-viscosity liquids showed oscillation, while high-viscosity liquids exhibited overdamping during zooming.
- Proposed methods accelerated lens stabilization by approximately 30% (low viscosity) and 50% (high viscosity).
Conclusions:
- The LB-ED method accurately simulates EWOD liquid lens zooming.
- Voltage control enables tunable focal lengths, with distinct dynamic behaviors based on viscosity.
- Optimized stabilization methods significantly improve lens response times for various liquid viscosities.
- Higher viscosity liquids necessitate higher voltages for comparable movement speeds.
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