Surface plasmon nanolithography: impact of dynamically varying near-field boundary conditions at the air–polymer interface
It is well-known that surface plasmon generated near fields of suitably irradiated metal nano-structures can induce a patterning in an azobenzene-modified photosensitive polymer film placed on top. The change in the topography usually follows closely and permanently the underlying near field intensi...
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Veröffentlicht in: | Journal of materials chemistry 2012-01, Vol.22 (13), p.5945-5950 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | It is well-known that surface plasmon generated near fields of suitably irradiated metal nano-structures can induce a patterning in an azobenzene-modified photosensitive polymer film placed on top. The change in the topography usually follows closely and permanently the underlying near field intensity pattern. With this approach, one can achieve a multitude of morphologies by additionally changing light intensity, polarization and the kind of metal used for nano-structuring. In this paper, we demonstrate that below a critical value of the polymer film thickness, the receding polymer material induces a change in refractive index of the glass-metal-polymer system, modifying the near field intensity distribution and causing a back-reaction on the flow of polymer material. This has a profound influence on the smallest size of topographical features that can be imprinted into the polymer. |
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ISSN: | 0959-9428 1364-5501 |
DOI: | 10.1039/c2jm15864g |