Liquid crystal elastomer actuator (1) apt to move in a fluid, wherein the actuator includes a body (10) having a dimension comprised between 100 nm and 800 μιη so as to be considered a body having a low Reynolds number. The body (10) comprises: at least a first (2;2a;2b; 20) and a second (3;2c;2d; 30) spatially separated volumes, the first and second volume of the body both comprising a liquid crystal elastomer. The first volume is doped with a first photoactive doping substance apt to absorb electromagnetic radiation at a first wavelength, and the second volume is doped with a second photoactive doping substance apt to absorb electromagnetic radiation at a second wavelength. The first and second volumes are apt to change shape as a consequence of the light absorption at first or second wavelength, so that in the body a first (2j;20j) and a second joint (3j;30j) are defined. Moreover, a first absorbance of the first volume at a given wavelength is different than a second absorbance of the second volume at said given wavelength, the first and second absorbance are measured in the same time interval.
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