Circular dielectric liquid iris

C. Gary Tsai; J. Andrew Yeh

doi:10.1364/OL.35.002484

Optics Letters
Vol. 35,
Issue 14,
pp. 2484-2486
(2010)
•https://doi.org/10.1364/OL.35.002484

Circular dielectric liquid iris

C. Gary Tsai and J. Andrew Yeh

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C. Gary Tsai and J. Andrew Yeh, "Circular dielectric liquid iris," Opt. Lett. 35, 2484-2486 (2010)

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Abstract

We demonstrate a liquid iris diaphragm using dielectric force, enabling its aperture to vary from $4 mm$ at the resting state to $1.5 mm$ at $160 V_{rms}$ . The liquid iris is a packaged optical component comprised of transparent oil, opaque ink, and a set of driving electrodes on a glass substrate. The iris aperture shrinks with the dielectric force, which is exerted on the interface between the two nonconductive liquids. The transmittance was measured to exceed 85% with no antireflection coatings over the spectrum of visible light. The maximum electric power consumed is measured to be $5.7 mW$ .

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Applied Voltage ( $V_{rms}$ )	40	60	80	100	120	140	160
Actuated aperture (mm)	$3.9 \pm 0.02$	$3.6 \pm 0.01$	$3.2 \pm 0.01$	$2.9 \pm 0.01$	$2.5 \pm 0.02$	$2.1 \pm 0.03$	$1.5 \pm 0.04$
Current ( $μA$ )	$22 \pm 1.6$	$33 \pm 1.7$	$52 \pm 1.5$	$74 \pm 3.8$	$105 \pm 2.8$	$144 \pm 3.2$	$186 \pm 4.1$
Power (mW)	$0.14 \pm 0.01$	$0.31 \pm 0.02$	$0.65 \pm 0.02$	$1.15 \pm 0.07$	$1.98 \pm 0.06$	$3.15 \pm 0.08$	$4.66 \pm 0.11$
Actuation time (s)	$0.14 \pm 0.02$	$0.24 \pm 0.02$	$0.45 \pm 0.04$	$0.43 \pm 0.04$	$0.50 \pm 0.03$	$0.67 \pm 0.02$	$1.08 \pm 0.02$
Relaxation time (s)	$0.07 \pm 0.01$	$0.13 \pm 0.01$	$0.18 \pm 0.02$	$0.20 \pm 0.02$	$0.20 \pm 0.02$	$0.22 \pm 0.02$	$0.25 \pm 0.02$

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Optics Letters