Nanoimprint lithography system and method
A method for transferring a pattern from a template to a nanoimprint object. A perimeter portion of the nanoimprint object is supported by a perimeter support structure. A gas pressure induced force is applied to the nanoimprint object to facilitate bending of a central portion of the nanoimprint object in a direction toward a surface of the template until the central portion of the nanoimprint object is brought into contact with the surface of the template. While the nanoimprint object is held in contact with the surface of the template, the pattern from the template is transferred to a surface of the nanoimprint object thereby creating a patterned surface on the nanoimprint object.
1. A method for transferring a pattern from a template to a nanoimprint object, the method comprising:
supporting a perimeter portion of the nanoimprint object by a perimeter support structure to form a space between the nanoimprint object and the template;
applying a gas pressure induced force to the nanoimprint object to facilitate bending of a central portion of the nanoimprint object in a direction toward a surface of the template based on drawing a gas out of the space;
increasing the gas pressure induced force until the central portion of the nanoimprint object is brought into contact with the surface of the template; and
transferring the pattern to a surface of the nanoimprint object while the nanoimprint object is held in contact with the surface of the template, thereby creating a patterned surface on the nanoimprint object.
2. The method of claim 1 , wherein the nanoimprint object is planar in shape.
3. The method of claim 1 ,
wherein the nanoimprint object comprises a pliable substrate; and
wherein the pattern is transferred to a surface of the pliable substrate.
4. The method of claim 1 ,
wherein the nanoimprint object comprises a substrate layer and a pliable layer disposed on the substrate layer; and
wherein the pattern is transferred to a surface of the pliable layer.
5. The method of claim 4 , wherein the pliable layer comprises a layer of photoresist material.
6. The method of claim 1 , further comprising actuating one or more control pads, while the nanoimprint object is held in contact with the surface of the nanoimprint object, to control a deformation shape of the nanoimprint object.
7. The method of claim 1 , wherein the nanoimprint object forms a flexible chamber wall of a chamber that houses the template.
8. The method of claim 7 , wherein the gas pressure induced force is caused by a pressure differential, and the pressure differential is caused by reducing a gas pressure inside the chamber relative to a gas pressure outside the chamber.
9. The method of claim 7 , wherein the gas pressure induced force is caused by a pressure differential, and the pressure differential is caused by increasing a gas pressure outside the chamber relative to a gas pressure inside the chamber.
10. The method of claim 1 , further comprising:
unbending the nanoimprint object by reducing the gas pressure induced force to facilitate separation of the patterned surface of the nanoimprint object from the surface of the template; and
removing the nanoimprint object from the perimeter support structure.
11. The method of claim 10 , further comprising actuating one or more control pads to provide a controlled counter-force that further facilitates separation of the patterned surface of the nanoimprint object from the surface of the template.
12. The method of claim 10 , wherein the bending and unbending of the nanoimprint object are elastic deformations of the nanoimprint object.
13. The method of claim 1 , wherein the nanoimprint object forms a flexible chamber wall of a first chamber; and
wherein the template is housed in a second chamber, the second chamber being connected to the first chamber.
14. The method of claim 13 , wherein the second chamber is in a chuck that also includes the perimeter support structure.
15. The method of claim 13 , wherein the second chamber includes a shelf portion to support the template; and
wherein a first seal is disposed between the shelf portion and the template to form the second chamber.
16. The method of claim 13 , wherein a second seal is disposed between the perimeter portion of the nanoimprint object and the perimeter support structure to form the first chamber.
17. The method of claim 1 , wherein a shape of the perimeter support structure matches a shape of the nanoimprint object.
18. The method of claim 1 , wherein the nanoimprint object is formed from a transparent material.
19. The method of claim 1 , wherein the gas pressure induced force is applied until a second portion of the nanoimprint object is brought into contact with a control pad such that the nanoimprint object follows a pre-defined shape.
20. The method of claim 19 , wherein the pre-defined shape comprises a pre-defined curvature.
21. The method of claim 19 , further comprising: separating the nanoimprint object from the template after the pattern is transferred to the surface of the nanoimprint object; and
wherein the separating is performed based on at least one of: reducing the gas pressure induced force, or moving the control pad against the nanoimprint object.
22. A method for transferring a pattern from a template to a nanoimprint object, the method comprising:
supporting a perimeter portion of the nanoimprint object by a perimeter support structure, wherein the nanoimprint object forms a flexible chamber wall of a chamber that houses the template;
applying a gas pressure induced force to the nanoimprint object to facilitate bending of a central portion of the nanoimprint object in a direction toward a surface of the template;
increasing the gas pressure induced force until the central portion of the nanoimprint object is brought into contact with the surface of the template; and
transferring the pattern to a surface of the nanoimprint object while the nanoimprint object is held in contact with the surface of the template, thereby creating a patterned surface on the nanoimprint object.
23. The method of claim 22 , wherein the chamber comprises a first chamber and a second chamber;
wherein the second chamber houses the template; and
wherein the first chamber is connected to the first chamber, the nanoimprint object forming the flexible chamber wall of the first chamber.
24. The method of claim 23 , wherein the second chamber is in a chuck that also includes the perimeter support structure.
25. The method of claim 23 , wherein the second chamber includes a shelf portion to support the template; and
wherein a first seal is disposed between the shelf portion and the template to form the second chamber.
26. The method of claim 23 , wherein a second seal is disposed between the perimeter portion of the nanoimprint object and the perimeter support structure to form the first chamber.
27. The method of claim 23 , wherein a shape of the perimeter support structure matches a shape of the nanoimprint object.
28. The method of claim 22 , wherein the nanoimprint object is formed from a material.
29. The method of claim 22 , wherein the gas pressure induced force is applied until a second portion of the nanoimprint object is brought into contact with a control pad such that the nanoimprint object follows a pre-defined shape.
30. The method of claim 29 , wherein the pre-defined shape comprises a pre-defined curvature.
31. The method of claim 29 , further comprising: separating the nanoimprint object from the template after the pattern is transferred to the surface of the nanoimprint object; and
wherein the separating is performed based on at least one of: reducing the gas pressure induced force, or moving the control pad against the nanoimprint object.