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21 July 2004 Nanoscale nondestructive electric field probing in ferroelectrics, organic molecular films and near-field optical nanodevices
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Abstract
Inspecting and tuning electric fields on the nanometer scale offers a great potential in overcoming limitations inherent in assembling nanostructures. Both optical and electronic devices may be improved in performance provided that a quantitative knowledge on the strength and orientation of local (stray) fields is gained. Here we present nanoscale investigations of functional surfaces probing the surface potential and electronic properties of ferroelectric and ultra thin organic films. We developed methodologies that are able to non-invasively track the electric field both above and below interfaces, thus providing insight also into the sample. Hence, interface dipole formation and interface charging directly shows up in potential changes revealing the donor/acceptor characteristics of molecules, as well as the surface charge screening in ferroelectrics. Such inspections are possible using conventional scanning force microscopy operated in sophisticated modes measuring the electrostatic force or the inverse piezoelectric effect. Finally, electric fields are also probed in the optical regime using near-field optical methods. Examples are shown where the strength and frequency of surace plasmon resonances become tunable due to simple nanostructuring of metallic thin films.
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Lukas M. Eng, Stefan Grafstrom, Ingo Hellmann, Christian Loppacher, Tobias Otto, Jan Renger, Frank Schlaphof, Jan Seidel, and Ulrich Zerweck "Nanoscale nondestructive electric field probing in ferroelectrics, organic molecular films and near-field optical nanodevices", Proc. SPIE 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II, (21 July 2004); https://doi.org/10.1117/12.544503
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