Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Postersession II
DS 44.43: Poster
Thursday, March 23, 2017, 17:00–19:00, P1C
Simulating Interferometric Spectra using Multiple Matrix Methods — •Kai Alexander Schwenzfeier1, Andreas Erbe2, and Markus Valtiner3 — 1MPIE, Düsseldorf, Germany — 2NTNU, Trondheim, Norway — 3TU-BAF, Freiberg, Germany
The analytical equations used for evaluating Surface Forces Apparatus (SFA) data were derived on the basis of a number of simplifications, but the actual impact of these simplifications is largely unknown. Especially the influence of mirror materials has completely been neglected.
By simulating SFA spectra for different interferometer layouts and different mirror materials and analysis of those spectra using the analytical equations it is possible to estimate the relative error done by using those equations.
The optical properties of the mirror material have a great impact on the peak shape as well as position of the resulting interference patterns. Especially with 10-20 nm thin mirrors and gold as mirror material the determination of the fringe order as one integral part of the analytical equations breaks down.
Our findings illustrate the need to reevaluate SFA data with respect to mirror materials and thicknesses with a suitable analysis tool. We developed a new software tool based on multiple matrix methods, that addresses these issues and allows the simulation of interferometer pattern based on the physical properties of the interferometer layers. Our simulation tools can be applied not only to SFA analysis but to general interferometry applications with white light.