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Schematic of an ILs-based EVFLL.
(Color online) Change of reciprocal of focal length (f) with square of the applied voltage (V) at room temperature. The solid lines are linear fits of experimental data. (a) For [EMIm][HSO4], [BMIm][HSO4], and [HMIm][HSO4]-based EVFLL. (b) For [EMIm][BF4] and H2O-based EVFLL.
(Color online) (a) Pictures taken by a CCD through a H2O-based EVFLL at 980 nm. The captured infrared images of [EMIm][BF4]-based EVFLL at the rest state (b) and at 50 volts (c). (d) Imaging of resolution chart through ILs-based EVFLL. (e) Movie of the focal length tuning of the [EMIm][BF4]-based EVFLL in the infrared light irradiation (enhanced online). [URL: http://dx.doi.org/10.1063/1.3663633.1]10.1063/1.3663633.1
Fitted values of the free parameters, a and b for H2O and four ILs-based EVFLL investigated.
Measured characteristics of [EMIm][BF4]-based EVFLL.
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