Optical tweezers controlling device

An optical tweezers controlling device, comprising:

• a light source for generating a light;
• an objective lens having a focal plane;
• and
• a focus adjusting unit disposed between the light source and the objective lens, wherein the focus adjusting unit comprises a mirror set having at least a row of mirrors, and the row of mirrors comprises a plurality of rotatable mirrors such that after the light from the light source is projected to the mirror set, the reflective direction of the light reflected from the mirror set is changeable;
• wherein, by rotating the mirrors, the focusing location of the light changes on the focal plane of the objective lens.

An optical tweezers controlling device, comprising:

• a light source for generating a light;
• an objective lens having a focal plane;
• and
• a focus adjusting unit disposed between the light source and the objective lens, wherein the focus adjusting unit comprises at least a row of zoom lens, and the focal length of each zoom lens is changeable;
• wherein, by changing the focal length of each zoom lens, the focusing location of the light changes in the front or the rear of the focal plane of the objective lens.