Mold, a device for processing the same, and a replica made therefrom

A device for processing a mold, comprising:

• a cutter configured to contact a surface of the mold and carve a plurality of peaks and grooves on the surface of the mold, the cutter being made from at least one of carbon steel, high speed steel, hard metal, or ceramics, the cutter having diamond particles that are adhered to a portion contacting the surface of the mold;
• a housing configured to have an area that accommodates the cutter and an aperture through which a portion of the cutter protrudes, wherein the cutter is spaced apart from the aperture by a predetermined distance;
• at least two piezoelectric elements configured to apply a mechanical variation to the cutter, the piezoelectric elements each having a different piezo-electric modulus and each being made from at least one of rochelle salts, barium titanate, or PZT, the at least two piezoelectric elements comprising a first piezoelectric element and a second piezoelectric element;
• and
• a signal generator configured to apply an electrical signal to induce a vertical displacement of the piezoelectric elements wherein the first piezoelectric element and the second piezoelectric element produce different vertical displacements even though the electrical signal transmitted to the first and second piezoelectric elements is identical,
• wherein the cutter produces a horizontal displacement along with a vertical displacement produced by the different vertical displacements of the first and second piezoelectric elements,
• wherein the peaks and grooves carved by the cutter have a randomly varying shape.