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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 17,
  • Issue 6,
  • pp. 062201-
  • (2019)

Nonuniform self-imaging of achromatic Talbot lithography

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Abstract

Achromatic Talbot lithography (ATL) with high resolution has been demonstrated to be an excellent technique for large area periodic nano-fabrication. In this work, the uniformity of pattern distribution in ATL was studied in detail. Two ATL transmission masks with ∼50% duty cycle in a square lattice were illuminated by a spatial coherent broadband extreme ultraviolet beam with a relative bandwidth of 2.38%. Nonuniform dot size distribution was observed by experiments and finite-difference time-domain simulations. The sum of the two kinds of diffraction patterns, with different lattice directions (45° rotated) and different intensity distributions, results in the final nonuniform pattern distribution.

© 2019 Chinese Laser Press

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