Abstract:
A lithographic method related to Talbot imaging for printing a desired pattern of features that is periodic or quasi-periodic in at least one direction onto a substrate surface, which method includes providing a mask bearing a pattern of mask features, arranging the substrate parallel and in proximity to the mask, providing an illumination source having a central wavelength and a spectral bandwidth, forming from said source an illumination beam with an angular distribution of intensity, arranging the distance of the substrate from the mask and exposing the mask pattern to said beam so that each angular component of illumination exposes the substrate to substantially the entire range of lateral intensity distributions that occur between successive Talbot image planes for the illumination wavelengths, wherein the angular distribution of the beam is designed in conjunction with the pattern of features in the mask and the distance of the substrate from the mask.
Abstract:
A method for printing a desired pattern into a photosensitive layer that includes providing a mask bearing a pattern of linear features that are parallel to a first direction, arranging the layer parallel to and separated from said mask, generating substantially monochromatic light, and illuminating the mask pattern with said light over a range of angles of incidence in a plane parallel to said first direction, at substantially a single angle in an orthogonal plane of incidence and so that the light of each angle of incidence transmitted by the mask forms a light-field component at the layer whereby the integration of said components prints the desired pattern, wherein the range of angles is selected so that the integration of said components is substantially equivalent to an average of the range of transversal intensity distributions formed between Talbot image planes by light at one of the angles of incidence.
Abstract:
A method for printing a desired pattern into a photosensitive layer that includes providing a mask bearing a pattern of linear features that are parallel to a first direction, arranging the layer parallel to and separated from said mask, generating substantially monochromatic light, and illuminating the mask pattern with said light over a range of angles of incidence in a plane parallel to said first direction, at substantially a single angle in an orthogonal plane of incidence and so that the light of each angle of incidence transmitted by the mask forms a light-field component at the layer whereby the integration of said components prints the desired pattern, wherein the range of angles is selected so that the integration of said components is substantially equivalent to an average of the range of transversal intensity distributions formed between Talbot image planes by light at one of the angles of incidence.
Abstract:
A method for printing a pattern of features including the steps of providing a substrate having a recording layer disposed thereon, providing a mask bearing a periodic pattern of features, arranging the substrate parallel to the mask and with a separation having an initial value, providing an illumination system for illuminating the mask with an intensity of monochromatic light to generate a transmitted light-field for exposing the recording layer, and illuminating the mask for an exposure time while changing the separation by a distance having a desired value and with a rate of change of separation, wherein at least one of the rate of change of separation and the intensity of light are varied during the change of separation, whereby the mask is illuminated by an energy density per incremental change of separation that varies over said distance.
Abstract:
A lithographic method related to Talbot imaging for printing a desired pattern of features that is periodic or quasi-periodic in at least one direction onto a substrate surface, which method includes providing a mask bearing a pattern of mask features, arranging the substrate parallel and in proximity to the mask, providing an illumination source having a central wavelength and a spectral bandwidth, forming from said source an illumination beam with an angular distribution of intensity, arranging the distance of the substrate from the mask and exposing the mask pattern to said beam so that each angular component of illumination exposes the substrate to substantially the entire range of lateral intensity distributions that occur between successive Talbot image planes for the illumination wavelengths, wherein the angular distribution of the beam is designed in conjunction with the pattern of features in the mask and the distance of the substrate from the mask.
Abstract:
A method for printing a pattern of features including the steps of providing a substrate having a recording layer disposed thereon, providing a mask bearing a periodic pattern of features, arranging the substrate parallel to the mask and with a separation having an initial value, providing an illumination system for illuminating the mask with an intensity of monochromatic light to generate a transmitted light-field for exposing the recording layer, and illuminating the mask for an exposure time whilst changing the separation by a range having a predetermined value and varying at least one of the rate of change of separation and the intensity of illumination so that the mask is illuminated by an energy density per incremental change of separation that varies over said range, whereby the printed pattern has low sensitivity to a deviation of the range from said predetermined value or to the initial value of the separation.
Abstract:
A lithographic method related to Talbot imaging for printing a desired pattern of features that is periodic or quasi-periodic in at least one direction onto a substrate surface, which method includes providing a mask bearing a pattern of mask features, arranging the substrate parallel and in proximity to the mask, providing an illumination source having a central wavelength and a spectral bandwidth, forming from said source an illumination beam with an angular distribution of intensity, arranging the distance of the substrate from the mask and exposing the mask pattern to said beam so that each angular component of illumination exposes the substrate to substantially the entire range of lateral intensity distributions that occur between successive Talbot image planes for the illumination wavelengths, wherein the angular distribution of the beam is designed in conjunction with the pattern of features in the mask and the distance of the substrate from the mask.
Abstract:
A method for printing a periodic pattern of features into a photosensitive layer includes providing a mask bearing a mask pattern, providing a substrate bearing the layer, arranging the substrate parallel to the mask, providing a number of lasers having a plurality of peak wavelengths, forming from the light a beam for illuminating the mask with a spectral distribution of exposure dose and a degree of collimation, illuminating the mask with the beam such that the light of each wavelength transmitted by the mask pattern forms a range of transversal intensity distributions between Talbot planes and exposes the photosensitive layer to an image component. The separation and the spectral distribution are arranged so that the superposition of the components is equivalent to an average of the range of transversal intensity distributions formed by light of one wavelength and the collimation is arranged so that the features are resolved.
Abstract:
A method for printing a pattern of features including the steps of providing a substrate having a recording layer disposed thereon, providing a mask bearing a periodic pattern of features, arranging the substrate parallel to the mask and with a separation having an initial value, providing an illumination system for illuminating the mask with an intensity of monochromatic light to generate a transmitted light-field for exposing the recording layer, and illuminating the mask for an exposure time whilst changing the separation by a distance having a desired value and with a rate of change of separation, wherein at least one of the rate of change of separation and the intensity of light are varied during the change of separation, whereby the mask is illuminated by an energy density per incremental change of separation that varies over said distance.
Abstract:
A lithographic method related to Talbot imaging for printing a desired pattern of features that is periodic or quasi-periodic in at least one direction onto a substrate surface, which method includes providing a mask bearing a pattern of mask features, arranging the substrate parallel and in proximity to the mask, providing an illumination source having a central wavelength and a spectral bandwidth, forming from said source an illumination beam with an angular distribution of intensity, arranging the distance of the substrate from the mask and exposing the mask pattern to said beam so that each angular component of illumination exposes the substrate to substantially the entire range of lateral intensity distributions that occur between successive Talbot image planes for the illumination wavelengths, wherein the angular distribution of the beam is designed in conjunction with the pattern of features in the mask and the distance of the substrate from the mask.