Atomoptische Interferenz- und Lithographieexperimente mit metastabilem Helium

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NOWAK, Stephan, 1998. Atomoptische Interferenz- und Lithographieexperimente mit metastabilem Helium [Dissertation]. Konstanz: University of Konstanz

@phdthesis{Nowak1998Atomo-4781, title={Atomoptische Interferenz- und Lithographieexperimente mit metastabilem Helium}, year={1998}, author={Nowak, Stephan}, address={Konstanz}, school={Universität Konstanz} }

Nowak, Stephan deposit-license 2011-03-24T14:50:17Z deu application/pdf 2011-03-24T14:50:17Z 1998 Atomoptische Interferenz- und Lithographieexperimente mit metastabilem Helium In this thesis experiments are described, where a beam of metastable helium is used for atom optic interferometry experiments<br />as well as for lithography. The broad potential of atom optics for fundamental as well as applied research could thus be used.<br />In the first experiment described in this work, dealing with atom lithography, a lithographic resist technique was implemented,<br />basing on the structural changes of single molecules of a self-assembling monolayer of dodecanethiol due to Penning processes<br />induced by metastable helium atoms.<br />This molecular layer could be laterally structured with respect to its hydrophobicity properties. In a chemical etching step, the<br />structure in the local wetability could be transferred into an underlying gold layer, producing sharp structures there. It could be<br />shown experimentally, that this change of the wetability is essential for the process.<br />In the second experiment, the Talbot effect was investigated with de-Broglie waves, which is the phenomenon of interferometric<br />self imaging of a transmission grating at the characteristic distance of the Talbot length from the grating.<br />Special interest was taken in the demonstration of the fractional Talbot effect, that is the self imaging of the transmission grating<br />with reduced period, because this effect is in principle useful for the production of very small structures in the atomic density<br />distribution of an atom beam. Fractional self imaging up to seventh order with periods of one micron could be observed in the<br />experiment.<br />The third experiment is on diffraction of de-Broglie waves by a wire and on refraction of atomic de-Broglie waves by a<br />rotationally symmetric potential. The Poisson interference spot in the center of the shadow of the wire was experimentally<br />demonstrated as well as Fresnel diffraction fringes at<br />the edges of the wire. Well defined voltages could be applied to two plate electodes opposite the wire, producing a radial<br />electric field in the vicini Nowak, Stephan

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