Optical rotation control of pyrolytic graphite magnetically levitated on square-arrayed magnet
In this paper,the optical rotation control of pyrolytic graphite disk suspend above a rectangular permanent magnet array is investigated.Using MATLAB to simulate the magnetic field distribution of the permanent magnet array at a levitation height of 1 mm,and the variation of torque of pyrolytic graphite disk with rotation angle of laser irradiation point,different distances along the radius and laser power.Using a laser with a wavelength of 808 nm to irradiate pyrolytic graphite disk,it was observed that when the laser was irradiated on the boundaries of x=0,y=0,y=x,and y=-x,the pyrolytic graphite disk was stationary.The pyrolytic graphite disk rotated clockwise or counterclockwise when the laser irradiated the regions Ⅰ,Ⅲ,Ⅴ,Ⅶ or Ⅱ,Ⅳ,Ⅵ,Ⅷ.As the laser irradiation point moved outward along the radius,the rotational speed of the pyrolytic graphite disk increased first,and then decreased.The rotational speed of pyrolytic graphite disk increased with the laser power.The experimental results and the calculated torque are consistent.The light driving law of a circular pyrolytic graphite sheet suspended above a rectangular permanent magnet array is obtained.
magnetic levitationpyrolytic graphitepermanent magnetoptical rotation control
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