S. Nicolas et al., FABRICATION OF A GRAY-TONE MASK AND PATTERN TRANSFER IN THICK PHOTORESISTS, Journal of micromechanics and microengineering, 8(2), 1998, pp. 95-98
A low-cost gray-tone mask fabrication for thick resist UV lithography
is described. The experimental relation between the theoretical transm
ission and the remaining resist thickness after development is present
ed.