Wide-spectrum zoom electrowetting liquid lens with a centimeter aperture

Area of Science:

• Optics and Photonics
• Materials Science
• Electrochemistry

Background:

• Traditional aqueous electrowetting systems suffer from poor thermal stability, electrode corrosion, and limited near-infrared (NIR) transmittance.
• Ionic liquids present a promising alternative due to their inherent stability and broad spectral transmittance.

Purpose of the Study:

• To develop and evaluate a novel ionic liquid formulation for electrowetting liquid lenses.
• To enhance near-infrared transmittance and overall performance of liquid lenses for adaptive optics.

Main Methods:

• A new ionic liquid formulation, the EFN series, was synthesized and characterized.
• A 10-mm caliber electrowetting liquid lens was fabricated using the EFN series formulation.
• Optical transmittance, response time, and zoom range were measured under varying applied voltages (0-70 V).

Main Results:

• The EFN series formulation demonstrated a transmittance exceeding 92% across a wide spectrum.
• The resulting liquid lens achieved a maximum zoom range of 13.93 m⁻¹.
• A rapid response time of approximately 100 milliseconds was recorded, with clear imaging capabilities.

Conclusions:

• The developed ionic liquid formulation significantly overcomes the limitations of traditional aqueous systems.
• The wide-band zoom electrowetting liquid lens exhibits excellent performance, meeting demands for real-time adaptive regulation.
• Ionic liquids are a viable and advantageous medium for advanced liquid lens applications.