Patent ID: 8687170

Claim:
A method; comprising: passing light of a selected wavelength through openings of a first asymmetrical complementary dipole element, said first asymmetrical complementary dipole element having a first critical dipole bisected by a first axis and a first complementary dipole bisected by a second axis, said first axis perpendicular to said second axis; after passing said light through said first asymmetrical complementary dipole element, passing said light through a first patterned photomask; after passing said light through said first patterned photomask, projecting said light onto said photoresist layer; passing light of said selected wavelength through openings of a second asymmetrical complementary dipole element, said second asymmetrical complementary dipole element having a second critical dipole bisected by said second axis and a second complementary diode bisected by said first axis; after passing said light through said second asymmetrical complementary dipole element, passing said light through a second patterned photomask; after passing said light through said second patterned photomask, projecting said light a onto said photoresist layer; wherein said first critical dipole comprises solid arc shaped first and second openings being equidistant and mirror images about said second axis, said first and second openings having essentially a same first area, said first complementary dipole comprises third and fourth openings being equidistant and mirror images about said first axis, said third and fourth openings having essentially a same second area, said first area different from said second area; and wherein said second critical dipole comprises solid arc shaped fifth and sixth openings being equidistant and mirror images about said first axis, said fifth and sixth openings having essentially a same third area, said second complementary dipole comprises seventh and eighth openings being equidistant and mirror images about said second axis, said seventh and eighth openings having essentially a same fourth area, said third area different from said fourth area.