To provide a structure for light switch in which the transmission of a light signal is controlled by moving a liquid metal containing a slug with a piezoelectric driving and to provide a switching method.

The structure for light switch 100 has a chamber 285 housed in a solid materials 110 and 120 and having a driving device liquid 250, a plurality of sealing belts 203 located in the chamber and coupled to the solid materials, a plurality of liquid metal droplets 320 coupled to the plurality of sealing belts and coupled to the chamber, a slug 325 coupled to one or more liquid metal droplets and also coupled to one or more switch contacts, a plurality of piezoelectric elements 245 coupled to a plurality of thin films 295 coupled to the chamber, and a plurality of optical waveguides 170 coupled to the chamber and so operated to be closed or opened by the slug.