This invention relates to a process for moving a particle using a device comprising a substrate (4), a wave guide (2) and a grating (6) formed on the wave guide, in which: light with wavelength .lamda. is injected into the wave guide, the light transmitted through the guide is diffracted to a medium (14) with an index nsup in which the particle is located.

 
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> Antireflection film, and image display device

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