Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7135141 | Sensors and Actuators A: Physical | 2016 | 7 Pages |
Abstract
Because a tunable microlens can focus the incident light and shift the focal point, a tunable microlens array (TMLA) with a large fill-factor was fabricated by a self-assembly method. Interestingly, each microcavity was filled completely with a liquid droplet, forming a hemispherical profile by capillary forces. The TMLA had a large fill-factor of up to 98% and various sag heights. Moreover, when a gated square-wave voltage was applied, the focal length of TMLA could be tuned from the initial 540 μm to 140 μm by electrohydrodynamic force simultaneously; both of the rise and decay time were within 50 ms. These results indicate that this novel method can construct TMLA with a large fill-factor, thus providing a new perspective towards portability, miniaturization, and low-cost applications.
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Authors
Rui Li, Lanlan Wang, Hongzhong Liu, Weitao Jiang, Yongsheng Shi, Lei Yin, Yongkai Zhu,