Micro grating structure

A micro grating structure, comprising:

• a substrate;
• a first supporting structure and a second supporting structure;
• a plurality of pairs of structure posts, each pair of said structure posts comprise a first structure post and a second structure post, wherein said first structure post and said second structure post are mounted on said substrate between said first supporting structure and said second supporting structure;
• and
• a plurality of gratings mounted between said first structure post and said second structure post of each pair of said structure posts respectively and having an interval between each two adjacent ones, wherein each said grating further comprises a first, a second, a third and a fourth torsion beams, said first and said second torsion beams are connected to said first and said second supporting structure respectively, said third and said fourth torsion beams are connected to said first and said second structure posts respectively, and said first, said second, said third and said fourth torsion beams are twisted by an electrostatic force so as to enable said grating to be inclined at an angle with respect to said substrate, wherein a light is diffracted by said plurality of gratings when said plurality of gratings are inclined, and said light is reflected by said plurality of gratings when said plurality of gratings are returned to normal, which is resulting from a recuperative force of said first, said second, said third and said fourth torsion beams generated after said electrostatic force vanishes.