An optical element including: a container which is light-transmissive at least in a light passage region; a light-transmissive dispersion medium enclosed in the container; a light-transmissive dispersion dispersed in the dispersion medium and having a refractive index different from the refractive index of the dispersion medium; and an electromagnetic field generator which controls the refraction of light passing through the light passage region by moving the dispersion dispersed in the dispersion medium by an electromagnetic force.

 
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< Position-measuring device for determining the position of two objects movable with respect to each other along a measuring direction, and method for forming a reference pulse for such a position-measuring device

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> Multi-element optical detectors with sub-wavelength gaps
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