Nanoimprint template with light blocking material and method of fabrication
A nanoimprint lithography template, method of fabrication, and method of manufacturing an article using the same. The template includes a body having first and second opposed sides, the second side having a mesa extending therefrom, with the mesa having sidewalls and a surface. A recessed shelf extends around a perimeter of the mesa surface, with a light-blocking material positioned on at least the recessed shelf and at a thickness such that the light-blocking material does not extend beyond a plane defined by the mesa surface.
1. A nanoimprint template comprising:
a body having first and second opposed sides, the second side having a mesa extending therefrom, the mesa having sidewalls and a surface, the surface having a pattern feature comprising a protrusion that extends from the surface;
a shelf recessed from the surface having the pattern feature and positioned between the sidewalls and the surface having the pattern feature, the shelf extending around a perimeter of the surface having the pattern feature; and
a light-blocking material positioned on the shelf at a thickness such that a top surface of the light-blocking material does not extend beyond the surface having the pattern feature.
2. The nanoimprint template of claim 1 wherein the light blocking material is chromium, molybdenum silicide, tungsten or tantalum.
3. The nanoimprint template of claim 1 wherein the shelf has a depth of 20 nm to 1 mm.
4. The nanoimprint template of claim 1 wherein the shelf extends from the mesa by a distance of 20 nm to 20 mm.
5. The nanoim print template of claim 1 further comprising light-blocking material positioned on at least a portion of the mesa sidewalls.
6. The nanoimprint template of claim 1 further comprising light-blocking material positioned on at least a portion of the second side of the template body.
7. The nanoimprint template of claim 1 wherein the shelf recessed from the surface defines a first shelf and further comprising a second shelf surrounding the first shelf and positioned between a plane defined by the mesa surface and a plane defined by the second side of the template.
8. The nanoimprint template of claim 7 wherein the light-blocking material is positioned on the second recessed shelf at a thickness that does not extend beyond the mesa surface.
9. The nanoimprint template of claim 1 further comprising a protective coating layer positioned on the light blocking material.
10. The nanoimprint template of claim 1 , further comprising:
a second light-blocking material provided on at least a part of the sidewalls of the mesa.
11. The nanoimprint template of claim 7 , wherein the second shelf is at a lower depth below the plane defined by the mesa surface relative to the first shelf.