28 April 2014 Adaptive liquid iris for optical switch
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An adaptive liquid iris for an optical switch based on electrowetting is demonstrated. The device consists of a clear conductive liquid and an opaque insulate oil. In the voltage-off state, the dome of the clear liquid touches the top substrate, and an iris-like opening is formed in its central area, and the aperture of the opening is at its largest. When a voltage is applied to the device, the shape of the conductive liquid is deformed due to the electrowetting effect. As a result, the diameter of the opening is reduced. Our results show that the aperture of the device can be tuned from ∼6.4  mm to 0 as the applied voltage is changed from 0 to ∼60  V . The device can obtain a high optical attenuation (∼8721 ). The response time was measured to be ∼117  ms (shrinking time is ∼25  ms , and relaxing time is ∼92  ms ) with turnaround speed of 55  mm/s . Our device has potential applications in light shutters, variable optical attenuators, adaptive irises, and displays.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Lei Li, Qiong-Hua Wang, Chao Liu, Ming-Huan Wang, "Adaptive liquid iris for optical switch," Optical Engineering 53(4), 047105 (28 April 2014). https://doi.org/10.1117/1.OE.53.4.047105 . Submission:

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