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Laser direct write system for fabricating seamless roll-to-roll lithography tools

Author(s)
Petrzelka, Joseph E.; Hardt, David E.
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.

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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
Implementations of roll to roll contact lithography require new approaches towards manufacturing tooling, including stamps for roll to roll nanoimprint lithography (NIL) and soft lithography. Suitable roll based tools must have seamless micro- or nano-scale patterns and must be scalable to roll widths of one meter. The authors have developed a new centrifugal stamp casting process that can produce uniform cylindrical polymer stamps in a scalable manner. The pattern on the resulting polymer tool is replicated against a corresponding master pattern on the inner diameter of a centrifuge drum. This master pattern is created in photoresist using a UV laser direct write system. This paper discusses the design and implementation of a laser direct write system targeting the internal diameter of a rotating drum. The design uses flying optics to focus a laser beam along the axis of the centrifuge drum and to redirect the beam towards the drum surface. Experimental patterning results show uniform coatings of negative photoresist in the centrifuge drum that are effectively patterned with a 405 nm laser diode. Seamless patterns are shown to be replicated in a 50 mm diameter, 60 mm long cylindrical stamp made from polydimethylsiloxane (PDMS). Direct write results show gratings with line widths of 10 microns in negative photoresist. Using an FPGA, the laser can be accurately timed against the centrifuge encoder to create complex patterns.
Date issued
2013-02
URI
http://hdl.handle.net/1721.1/97452
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Proceedings of SPIE--the International Society for Optical Engineering
Publisher
SPIE
Citation
Petrzelka, Joseph E., and David E. Hardt. “Laser Direct Write System for Fabricating Seamless Roll-to-Roll Lithography Tools.” Edited by Mary Ann Maher and Paul J. Resnick. Micromachining and Microfabrication Process Technology XVIII (March 9, 2013). © 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Version: Final published version
ISSN
0277-786X

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