Applying imprinting material to substrates employing electromagnetic fields
View Patent ↗The present invention comprises a method for applying a liquid, such as imprinting material, to a substrate that features use of an electromagnetic field to rapidly spread the liquid over a desired portion of the substrate, while confining the same to the desired region.
1. A method of applying a liquid to a substrate the method comprising the steps of:
disposing the liquid between the substrate and a template as a plurality of spaced-apart droplets;
positioning the template proximate to the substrate, the template comprising a first region and a second region, lying outside of a perimeter of the first region, the template further comprising electrodes positioned around the perimeter of the first region; and
moving the liquid to form a contiguous layer of said liquid over an area of the substrate in superposition with the first region by exposing said liquid to an electromagnetic field generated by said electrodes.
2. The method as recited in claim 1 , wherein moving further includes moving the liquid over the area and towards the perimeter of the first region while preventing the liquid from moving to portions of the substrate beyond the perimeter of the first region into the second region.
3. The method as recited in claim 1 , wherein the first region further includes patterned features comprising protrusions and recesses, wherein moving further includes compressing the liquid with the first region and solidifying the liquid to form a pattern conformal to the patterned features.
4. The method as recited in claim 1 , wherein the first region further includes a smooth surface, wherein moving further includes compressing the liquid with the first region and solidifying the liquid to form a pattern conformal to the smooth surface.
5. A method of applying a liquid to a substrate employing a template, the method comprising:
disposing the liquid on a surface of the substrate as a plurality of spaced-apart droplets;
positioning the template proximate to the liquid, the template comprising a first region, a second region and a conducting layer, a first portion of which surrounds the first region; and
generating, with the conducting layer of the template, an electromagnetic field to move the liquid to form a contiguous layer of said liquid over an area of the substrate in superimposition with the first region, while confining the liquid to be absent from portions of the substrate in superimposition with regions of the template outside of the first region.
6. The method as recited in claim 5 , wherein the first region further includes patterned features comprising protrusions and recesses, wherein positioning further includes compressing the liquid with the first region and solidifying the liquid to form a pattern conformal to the patterned features.
7. The method as recited in claim 6 , wherein disposing further includes depositing, on the substrate, the liquid as a plurality of spaced-apart droplets and generating the electric field further includes moving portions of the liquid in a subset of the plurality of spaced-apart droplets toward a perimeter of the first region.
8. The method as recited in claim 7 further includes, before generating, spreading liquid associated with the spaced-apart plurality of droplets by compressing the plurality of spaced-apart droplets between the template and the substrate.
9. A method of applying a liquid to a substrate employing a template, the method comprising:
disposing the liquid on a surface of the substrate;
positioning the template proximate to the liquid, the template comprising a first region, a second region surrounding a perimeter of the first region, and a conducting layer positioned around the perimeter of said first region; and
generating, with the conducting layer of the template, an electromagnetic field to move the liquid over an area of the substrate in superimposition with the first region towards the perimeter of the first region and not beyond the perimeter into the surrounding second region.
10. The method as recited in claim 9 , wherein the first region further includes patterned features comprising protrusions and recesses, wherein positioning further includes compressing the liquid with the first region and solidifying the liquid to form a pattern conformal to the patterned features.
11. A method of applying a liquid to a substrate employing a template, the method comprising the steps of:
disposing the liquid between the substrate and the template;
positioning the template proximate to the substrate, the template comprising an active region and an inactive region, lying outside of the active region, wherein the active region includes patterned features of a mold comprising protrusions and recesses, and the inactive region does not include patterned features, the template further comprising a ring of conductors positioned around a perimeter surrounding the active region; and
completely spreading the liquid over an area of the substrate in superposition with the active region by exposing said liquid to an electromagnetic field generated by the ring of conductors so that the liquid approaches but does not cross over the perimeter surrounding the active region.
12. The method as recited in claim 11 , wherein the active region further includes patterned features comprising protrusions and recesses, wherein moving further includes compressing the liquid with the active region and solidifying the liquid to form a pattern conformal to the patterned features.
13. The method as recited in claim 11 , wherein disposing further includes depositing, on the substrate, the liquid as a plurality of spaced-apart droplets, wherein moving further includes moving a portion of the liquid in a subset of the plurality of spaced-apart droplets toward the perimeter of the active region.