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Related Experiment Video

Updated: Jun 22, 2026

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
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Variable focus dielectric liquid droplet lens.

Chih-Cheng Cheng, C Alex Chang, J Andrew Yeh

    Optics Express
    |June 12, 2009
    PubMed
    Summary
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    Researchers demonstrated a liquid crystal droplet lens using dielectrophoresis (DEP) forces. This novel lens offers tunable focal length with a maximum tuning ratio of 60% and fast response times.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Liquid crystal droplet lenses offer tunable optical properties.
    • Dielectrophoresis (DEP) provides a method for manipulating liquid crystal behavior.
    • Controlling lens parameters like focal length is crucial for optical device development.

    Purpose of the Study:

    • To demonstrate a liquid crystal droplet lens actuated by dielectrophoresis (DEP) forces.
    • To investigate the influence of electrode design and electric fields on lens performance.
    • To characterize the focal length tunability, hysteresis, and power consumption of the DEP-driven lens.

    Main Methods:

    • Fabrication of a liquid crystal droplet lens system.
    • Application of non-uniform AC electric fields to induce DEP forces.

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    Published on: July 3, 2018

    Glass-Based Devices to Generate Drops and Emulsions
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    Glass-Based Devices to Generate Drops and Emulsions

    Published on: April 5, 2022

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    Last Updated: Jun 22, 2026

    Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
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    Published on: August 18, 2018

    Generation of Size-controlled Poly (ethylene Glycol) Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
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  • Systematic variation of voltage (0-200V) and frequency (1 kHz) to deform the droplet.
  • Measurement of focal length, contact angle hysteresis, and response time.

    • Main Results:

    • Achieved a maximum focal length tuning ratio of approximately 60% (1.6mm to 2.6mm) with a 50µm electrode spacing.
    • Observed contact angle hysteresis below 3 degrees, vanishing within 1 minute.
    • Demonstrated significantly reduced tuning ratios (<5%) for electrode spacings over 200µm.
    • Reported a numerical aperture of ~0.5, power consumption of ~0.1mW, and a response time of ~220 ms.

    Conclusions:

    • The DEP-driven liquid crystal droplet lens exhibits significant focal length tunability.
    • Electrode design, specifically spacing, critically impacts the tuning ratio.
    • The lens demonstrates promising characteristics for low-power, responsive optical applications.