Tunable microoptics deals with devices of which the optical properties can be changed during operation without mechanically\nmoving solid parts. Often a droplet is actuated instead, and thus tunable microoptics is closely related to microfluidics. One such\ndevice/module/cell type is an optical shutter, which is moved in or out of the path of the light. In our case the transmitting part\ncomprises a moving transparent and electrically conductive water droplet, embedded in a nonconductive blackened oil, that is, an\nopaque emulsion with attenuation of 30 dB at 570nm wavelength over the 250
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