Abstract
A dielectric liquid lens is prepared based on our previous work. By optimizing the device structure, the liquid lens presents a converging focus with good resolution and changes its focal length over a broad range with a low driving voltage. For a liquid lens with ~2.3 mm diameter in the relaxed state, it can resolve ~40 lp/mm. The resolution does not degrade during focus change. Its focal length can be varied from ~12 to ~5 mm when the applied voltage is changed from 0 to 28 Vrms. The response time of one cycle is ~2.5 s. Our liquid lens, with a low driving voltage for a large dynamic range, has potential applications in imaging, biometrics, optoelectronic, and lab-on-chip devices.
Highlights
Adaptive liquid lenses have potential applications in imaging, optoelectronic, biometrics, and lab-on-chip devices
In contrast to other liquid lenses, a liquid lens based on the dielectrophoretic effect [8,9,10,18] is attractive due to the advantages of easy fabrication, compact structure, direct voltage actuation, and low power consumption
For the previously demonstrated liquid lenses, they mainly face the challenge of a high driving voltage when a broad dynamic focus is changed
Summary
Adaptive liquid lenses have potential applications in imaging, optoelectronic, biometrics, and lab-on-chip devices. In contrast to other liquid lenses, a liquid lens based on the dielectrophoretic effect [8,9,10,18] is attractive due to the advantages of easy fabrication, compact structure, direct voltage actuation, and low power consumption. For the previously demonstrated liquid lenses, they mainly face the challenge of a high driving voltage when a broad dynamic focus is changed. Since the fringing field is independent on the cell gap, the liquid lens is scalable To generate such an electric field, either zone-patterned [8,10] or radial-patterned electrodes [20] can be adopted. Based on previously-patterned electrodes used for an optical switch [21], here we demonstrated a liquid lens This patterned electrode can help us improve the performances of our liquid lens. Our lens exhibits the advantages of scalable aperture size, good mechanical stability, and low power consumption
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