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Variable-Focus Fluid Lens Using an Electromagnetic Actuator

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Lee J., Park K., Choi J., Kim H., Kong S.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
202-204
EN
A variable-focus fluid lens controlled by an electromagnetic actuator and its characteristics are presented in this paper. The repulsive force between an NdFeB magnet and a solenoid through electromagnetic induction causes deflections in the elastomeric membranes integrated in the lens resulting in a focal-length change. The controllability of the focal length of the fabricated lens with an aperture size of 2 mm was approximately from infinity to 15 mm (with input current of 100 mA). The actuator including the solenoid was carefully designed to avoid thermal crosstalk of the lens fluid and magnet from the electromagnetic induction of the solenoid. The settling time to form a convex shape of the lens membrane was approximately 2.5 ms at an input current of 20 mA.
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Structural and Optical Properties of Hydrothermally Synthesized ZnO and Zn_{0.99}O:Eu³⁺ Powders

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Park K., Hakeem D., Kim J., Kim Y., Kim S.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
902-906
EN
The structural and optical properties of the ZnO and Zn_{0.99}O:Eu³⁺ powders synthesized by the hydrothermal method at two different temperatures (150°C and 250°C) were studied. The ZnO and Zn_{0.99}O:0.01Eu³⁺ powders synthesized at 150 and 250°C showed rod- and flower-like morphologies, respectively. The as-synthesized and annealed ZnO and Zn_{0.99}O:0.01Eu³⁺ powders formed the wurtzite crystal structure and P6₃mc space group. The crystallite size of the as-synthesized and annealed ZnO powders increased by the incorporation of Eu³⁺. The photoluminescence properties of annealed Zn_{0.99}O:0.01Eu³⁺ powders were substantially improved by controlling the synthesis temperature. The annealed Zn_{0.99}O:0.01Eu³⁺ powders synthesized at 250°C displayed much stronger emission intensity than those at 150°C.
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