New Developments in Experimental and Analytical Aspects of Light Figure Spectroscopy

概要

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Recent developments in light figure spectroscopy are reviewed with a purpose to promote their large-scale application to anisotropic materials and thin films. Both absolute and relative analytical approaches and the results of the experimental approval on the well-known uniaxial calcite, CaCO3, are given. Further generalization and extension onto optically active materials are described with a stress on a shrinkage effect that was predicted and observed for the first time. The numbering of the interference curves in the presence of gyration is shown to be different in comparison with gyration-free case. A universal approach to the determination of the correct interference order is proposed and found to be in a good agreement with experimental data on CaCO3, TeO2 and AgGaS2. The effectiveness of the light figure method with regard to the nanomodulated structures is demonstrated by the recent application to the novel thallium-contained incommensurate materials, TlInS2 and TlGaSe2. Thin film applications are discussed in terms of the merits of homogeneously and non-homogeneously polarized testing beams and isotropic and anisotropic substrates. A preference is given to anisotropic substrates which can provide creation of the optical vortexes with ellipsometric or higher sensitivity to film parameters and open a gateway to the light-figure-based characterization of the anisotropic films with vanishing thickness and optical anisotropy.
2005-01-15