Abstract
In this work, a focus-tunable lenticular microlens array (LMA) is demonstrated by coating an electro-responsive fluid - Acetyl tributyl citrate (ATBC) onto an in-plane switching (IPS) electrode. ATBC is a transparent liquid that is difficult to hydrolyzed, difficult to ionized, and has a wide working temperature range (-50 ∼ 260 ℃). At initial state, the ATBC film is smooth and flat, and the device has no lensing effect at this time. When a DC electric field is applied, the charge injected from the cathode polarizes the electronegative ATBC molecules and moves them toward the anode region, a wavy shape is formed and the device exhibit LMA lensing effect. After removing the voltage, the ATBC fluid rapidly returns to a flat state. When the voltage reaches 60 V, the focal length can reach as low as ∼ 180 μm. The proposed ATBC liquid lens has high transmittance, good thermal stability, compact structure, which has potential applications in imaging, information processing and 2D/3D displays.
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