Method of manufacturing template and method of forming pattern
A method of manufacturing a template, has: preparing a substrate containing quartz and having a surface, the surface including a protrusion and a depression; and processing the depression. The processing of the depression includes: a first step of forming a film on the surface, the film including a first region and a second region, the first region being provided on the protrusion, and the second region being provided on a bottom of the depression and being thinner than the first region; a second step of removing the second region with the first region partly remaining to expose the bottom of the depression; and a third step of processing the exposed part of the depression using a mask made of the remainder of the first region.
1. A method of manufacturing a template, comprising:
forming a first mask layer on a surface of a substrate, the substrate containing quartz, and the first mask layer containing chromium;
forming a second mask layer on a part of the first mask layer containing photoresist;
processing the first mask layer using the second mask layer to form a pattern of the first mask layer;
processing the substrate using the first mask layer with the pattern to form a protrusion and a depression on the surface; and
processing the depression,
the processing of the depression, including:
a first step of forming a film on the surface of the substrate from which the first and second mask layers are removed, the film including a first region and a second region, the first region being provided on the protrusion, and the second region being provided on a bottom of the depression and being thinner than the first region;
a second step of removing the second region with the first region partly remaining to expose the bottom of the depression; and
a third step of processing the exposed part of the depression using a mask made of the remainder of the first region.
2. The method according to claim 1 , wherein
the film contains chromium.
3. The method according to claim 2 , wherein
the second region is removed by dry etching or ashing using plasma generated from gas containing chlorine and oxygen.
4. The method according to claim 1 , wherein
the film contains carbon.
5. The method according to claim 4 , wherein
the film is a diamond-like carbon film.
6. The method according to claim 4 , wherein
the second region is removed by dry etching or ashing using plasma generated from gas containing oxygen or nitrogen.
7. The method according to claim 1 , wherein
the exposed part of the depression is processed by dry etching or ashing using plasma generated from gas containing tetrafluoromethane.
8. The method according to claim 1 , wherein
the processing of the depression is repeated.
9. The method according to claim 1 , wherein
before the processing of the depression, an inner wall surface of the depression of the substrate has a tapered surface inclining to the bottom thereof,
the film further includes a third region, the third region being provided on the tapered surface and being thinner than the first region, and
the second step includes removing the second and third regions with the first region partly remaining to expose the bottom and the tapered surface.
10. The method according to claim 1 , further comprising:
forming an optical layer on the depression after removing the film.
11. The method according to claim 1 , wherein
the surface further includes a second depression,
a width of the depression is larger than a width of the second depression,
the film further includes a fourth region, the fourth region filling the second depression and being thicker than the second region, and
the second region is removed with each of the first and fourth regions partly remaining.
12. The method according to claim 11 , further comprising:
forming an optical layer in the depression after removing the film,
the forming of the optical layer, including:
a fourth step of forming an optical layer, the optical layer including a first portion provided on the protrusion, a second portion provided on the depression, and a third portion provided on the second depression;
a fifth step of forming a third mask layer on the optical layer, the mask layer covering the first to third portions and having a protruding portion above the second portion;
a sixth step of partly removing the third mask layer to expose the first and third portions with covering the second portion, and
a seventh step of removing the first and third portions using the remainder of the third mask layer.
13. A method of forming a pattern, comprising:
forming a first mask layer on a surface of a substrate, the substrate containing quartz, and the first mask layer containing chromium;
forming a second mask layer on a part of the first mask layer containing photoresist;
processing the first mask layer using the second mask layer to form a pattern of the first mask layer;
processing the substrate using the first mask layer with the pattern to form a protrusion and a depression on the surface; and
processing the depression,
the processing of the depression, including:
a first step of forming a film on the surface of the substrate from which the first and second mask layers are removed, the film including a first region and a second region, the first region being provided on the protrusion, and the second region being provided on a bottom of the depression and being thinner than the first region;
a second step of removing the second region with the first region partly remaining to expose the bottom of the depression; and
a third step of processing the exposed part of the depression using a mask made of the remainder of the first region.
14. A method of manufacturing a template, comprising:
preparing a substrate containing quartz and having a surface, the surface including a protrusion and a depression; and
processing the depression,
the processing of the depression, including:
a first step of forming a film on the surface, the film including a first region and a second region, the first region being provided on the protrusion, and the second region being provided on a bottom of the depression and being thinner than the first region;
a second step of removing the second region with the first region partly remaining to expose the bottom of the depression; and
a third step of processing the exposed part of the depression using a mask made of the remainder of the first region,
wherein the surface further includes a second depression,
a width of the depression is larger than a width of the second depression,
the film further includes a fourth region, the fourth region filling the second depression and being thicker than the second region, and
the second region is removed with each of the first and fourth regions partly remaining.
15. The method according to claim 14 , further comprising:
forming an optical layer in the depression after removing the film,
the forming of the optical layer, including:
a fourth step of forming an optical layer, the optical layer including a first portion provided on the protrusion, a second portion provided on the depression, and a third portion provided on the second depression;
a fifth step of forming a mask layer on the optical layer, the mask layer covering the first to third portions and having a protruding portion above the second portion;
a sixth step of partly removing the mask layer to expose the first and third portions with covering the second portion, and
a seventh step of removing the first and third portions using the remainder of the mask layer.