Ms. Sheng Rong Profile

Sheng Rong

at Nankai Univ

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SPIE Journal Paper | 6 August 2018

Electrowetting optical switch with circular tunable aperture

Sheng Rong, Yannanqi Li, Lei Li

OE, Vol. 57, Issue 08, 087102, (August 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.8.087102

KEYWORDS: Liquids, Optical switching, Lithium, Signal attenuation, Domes, Switches, Adaptive optics, Beam controllers, Control systems, Glasses

Read Abstract +

We propose an optical switch with a circular tunable aperture based on electrowetting effect. The device is composed of two immiscible liquids. One liquid is dye-doped and conductive, while the other is transparent and insulating. The dye-doped water droplet is placed in the center of the bottom substrate, surrounded by transparent oil. In our experiment, in the voltage-off state, the light beam cannot pass through the aperture. When the voltage is applied, the black liquid expands in the radial direction because of the effect of electric field force and a circular aperture appears in the center of the device. Therefore, the device can achieve the function of light-on and light-off. Our device can provide a reasonable attenuation (∼582 ∶ 1). The aperture can be tuned from ∼0 to ∼5.8 mm. It requires ∼260 ms and ∼2.4 s for the device to switch on and off, respectively. Potential applications of this tunable optical switch are wide, for example, in adaptive irises, light shutters, and optical beam controls.

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