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Selected results of department 21

A "soft electronic band" and the negative thermooptic effect in strontium titanate

The optical properties of strontium titanate (SrTiO3) single crystals were determined with spectroscopic ellipsometry in the 1–6 eV spectral region and the 4.2–300 K temperature region.
New results regarding features of band edge and near band edge indirect and direct fundamental optical transitions were obtained and updated. The whole text »

Spectroscopic ellipsometry applied to phase transitions in solids: possibilities and limitations

The possibilities of in situ spectroscopic ellipsometry applied to phase transitions investigation in oxide thin films and crystals are examined in this work, along with the use of various parameters calculated from ellipsometric data (band gap energy Eg, refractive index n and surface roughness) together with the directly measured main ellipsometric angles ψ and Δ, for the detection of phase transitions.

DOI: http://dx.doi.org/10.1364/OE.17.014322 The whole text »