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Abstract: Optical measurements of nanostructured GaSb prepared by sputtering ispresented. The optical response is studied by Mueller Matrix Ellipsometry MMEin the visible range 430-850nm, and by spectroscopic ellipsometry in therange 0.6-6.5eV. The nano-structured surfaces reported in this work, consistof densely packed GaSb cones approximately 50nm high, on bulk GaSb. Thenanostructured surfaces are here shown to considerably modify the opticalresponse of the surface, hence giving a strong sensitivity to the far fieldspectroscopic Mueller matrix ellipsometric measurements. The off-specularscattering and the depolarization is found to be low. The anisotropic responseis particularly emphasized by studying nano-structured GaSb cones approximately45 degrees tilted with respect to the surface normal. In the latter case, oneobserves upon rotating the sample around the surface normal, that the Muellermatrix elements $m {13}$ and $m {14}$ oscillate as a function of the rotationangle. Finally, Mueller matrix techniques have been applied to the measureddata, in order to analyze the acquired Mueller matrix in terms of physicalrealizability and noise.

Author: M. Kildemo, I.S. Nerbo, E. Sondergard, L. Holt, I. Simonsen, M. Stchakovsky

Source: https://arxiv.org/


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