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Schematic of the microlens device with focal length tunability and light transmission control.
Tuning and focusing of the liquid microlens. (a) Observed images of the printed ambulance logo through the microlens. The logo was focused at volume values of 0, 11, and , respectively. (b) Focal length of the liquid microlens as a function of the volume.
Effect of the concentration on the imaging ability of the microlens at different temperatures.
(a) Temperature dependent transmittance of PNIPAAm at . The concentration of in the solution varied from to . (b) Relationship between the LCST of PNIPAAm and its concentration.
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