Tunable mirolens array with a large fill-factor: Self-assembly fabrication and electrodrodynamic actuation
•A high-density (fill-factor 98%) tunable microlens array was constructed.•Diverse substrates (rigid/flexible), without strict geometrical limit, were used.•Sag heights were controlled by pulling velocity and template at room temperature.•TMLA with electrodynamic force showed a four-fold varifocal c...
Saved in:
Published in | Sensors and actuators. A. Physical. Vol. 240; pp. 85 - 91 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.04.2016
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | •A high-density (fill-factor 98%) tunable microlens array was constructed.•Diverse substrates (rigid/flexible), without strict geometrical limit, were used.•Sag heights were controlled by pulling velocity and template at room temperature.•TMLA with electrodynamic force showed a four-fold varifocal capability in 50ms.
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 540μm to 140μm by electrohydrodynamic force simultaneously; both of the rise and decay time were within 50ms. 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. |
---|---|
Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0924-4247 1873-3069 |
DOI: | 10.1016/j.sna.2016.01.009 |