Patent ID: 9658535
Date: 2017-05-23
CPC Classifications: G03F

Claim:
1. A method for printing a desired one-dimensional or two-dimensional periodic pattern of features into a photosensitive layer, which method comprises the steps of: providing a mask bearing a periodic mask pattern of features; providing a substrate bearing the photosensitive layer; disposing the substrate substantially parallel to and with a separation from the mask; forming a beam of collimated monochromatic light for illuminating the periodic mask pattern of features so that a light-field transmitted by the mask forms Talbot image planes separated by a Talbot distance; performing N sub-exposures of the mask with the beam and changing a separation between the N sub-exposures such that a relative separation during an ith sub-exposure with respect to that during a first sub-exposure is given by (mi+ni/N) times the Talbot distance, where mi is an integer and ni takes each of the integer values from 0 to N−1 for different sub-exposures, wherein a period is selected in relation to a wavelength of illumination so that substantially only a zeroth and first diffraction orders are transmitted by the mask.