Voltage programmable optics: Liquid dielectrophoresis

Diffraction pattern from a green laser passing through a wrinkling film of oil.

When liquid travels from one material to another it usually changes direction. Lenses use this principle, but are usually made from glass or plastic. Solids do not easily change shape and so the strength of these optical devices are fixed by their manufacture.

Diffraction of white light by oil surface wrinkling
Nature Photon3 (2009) 403-405

Our experiments use liquids and shape their surfaces using a voltage to create liquid optical elements. These can be lenses using a droplet of oil or more complex diffractive devices to beam steer using a film of oil with a wrinkled surface.

The apparatus used to produce the diffraction pattern at the top of this page can be seen in the video below:

Experimental arrangement showing formation of oil film, creation of diffraction pattern and simultaneous interferometry to measure wrinkle profile on the film of oil.

Experimental arrangement showing formation of oil film, creation of diffraction pattern and simultaneous interferometry to measure wrinkle profile on the film of oil.

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