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Tunable-Focus Liquid Lens through Charge Injection.

Shizhi Qian1, Wenxiang Shi2, Huai Zheng2

  • 1Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.

Micromachines
|January 24, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel tunable-focus liquid lens using corona discharge to induce "electropressure." This simple method allows for large focal length adjustments, paving the way for new liquid lens applications.

Keywords:
charge injectionelectrohydrodynamicsliquid lenstunable focus

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Fluid Dynamics

Background:

  • Liquid lenses offer a cost-effective and simple alternative to traditional solid lenses.
  • Developing tunable-focus liquid lenses is crucial for advanced optical systems.
  • Existing methods for tunable liquid lenses can be complex or limited in range.

Purpose of the Study:

  • To propose and experimentally validate a simple and easily implemented method for creating tunable-focus liquid lenses.
  • To investigate the use of corona discharge-induced electropressure for focal length control.
  • To demonstrate a broad tunable focal range using a 3D-printed U-tube structure.

Main Methods:

  • Corona discharge was used to inject charges into a dielectric liquid.
  • Electropressure at the air-liquid interface was generated by the injected charges.
  • A 3D-printed U-tube structure was employed to fabricate and test the liquid lens.
  • The focal length was adjusted by varying the applied voltage.

Main Results:

  • A functional tunable-focus liquid lens was successfully fabricated and tested.
  • The liquid lens demonstrated focal length adjustability over large ranges (-∞ to -9 mm and 13.11 mm to ∞).
  • The applied voltage directly correlated with the degree of focal length adjustment.

Conclusions:

  • The proposed corona discharge method provides a simple and effective way to achieve tunable-focus liquid lenses.
  • The demonstrated large tunable focal range highlights the potential of this technique.
  • This research opens avenues for novel applications of liquid lenses in various fields.