Diffracted moiré fringes as analysis and alignment tools for multilayer fabrication in soft lithography

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2005-01-01
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Lee, Jae-Hwang
Kim, Chang-Hwan
Kim, Yong-Sung
Ho, Kai-Ming
Constant, Kristen
Leung, Wai
Oh, Cha-Hwan
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Constant, Kristen
Vice President and Chief Information Officer
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Abstract

We studied the first-order diffractedmoiré fringes of transparent multilayered structures comprised of irregularly deformed periodic patterns. By a comparison study of the diffractedmoiré fringe pattern and detailed microscopy of the structure, we show that the diffractedmoiré fringe can be used as a nondestructive tool to analyze the alignment of multilayered structures. We demonstrate the alignment method for the case of layer-by-layer microstructures using soft lithography. The alignment method yields high contrast of fringes even when the materials being aligned have very weak contrasts. The imaging method of diffractedmoiré fringes is a versatile visual tool for the microfabrication of transparent deformable microstructures in layer-by-layer fashion.

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The following article appeared in Applied Physics Letters 86 (2005): 204101 and may be found at http://dx.doi.org/10.1063/1.1927268.

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Sat Jan 01 00:00:00 UTC 2005
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