We report a tunable iris using two immiscible liquids. One liquid is opaque and conductive, while the other liquid is clear and insulating. The opaque liquid forms an iris-like opening in its central area on one glass substrate surface. The clear liquid is used to fill the outside space of the opaque liquid. In the voltage-off state, the opening presents the smallest aperture. When a voltage is applied to the liquids, the diameter of the iris is enlarged due to the electro-wetting effect. Our results show that the aperture of the iris can be tuned from ～2.3 to ～6.1 mm as the applied voltage is changed from 0 to ～65 V. The response time and the transmittance in the opening area were measured to be ～200 ms and ～85%, respectively. Our adaptive iris has potential applications in beam controls, light shutters, and lab-on-a-chip devices.
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