title: Implementation of phase-shift patterns using a holographic projection system with phase-only diffractive optical elements.
abstract: We proposed a method to implement spatial phase-shift patterns with subdiffraction limited features through a holographic projection system. The input device of the system displayed phase-only diffractive optical elements that were calculated using the iterative Fourier-transform algorithm with the dummy-area method. By carefully designing the target patterns to the algorithm, the diffractive optical elements generated the Fourier-transformed images containing the phase-shift patterns in which the widths of dark lines were smaller than the diffraction limit. With these demonstrations, we have successfully shown that the near-field phase-shift lithographic technique can be realized through an inexpensive maskless lithographic system and can still achieve subdiffraction limited images.
authors: Department of Electro-optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan. whsu@ntut.edu.tw
authors: Wei-Feng
authors: WF
authors: Hsu
authors: Yu-Wen
authors: YW
authors: Chen
authors: Yuan-Hong
authors: YH
authors: Su