Optical Properties of CuI, Doped CuI and CuI-Based Alloys

该项目的目的是详细研究卤化铜和卤化铜基合金的光学特性。特别感兴趣的是卤化物组合物对光学性质的影响，例如介电函数和基本光学跃迁的性质，以及发射和声子性质。为此目的，二元化合物以及三元和四元合金将通过各种光学方法进行研究，例如，（空间分辨）光谱椭圆偏振法、（微）反射率、拉曼光谱法、时间和空间分辨光致发光光谱法和激发光谱法。由于该材料系统中激子振子强度大，因此发生了强烈的光-物质相互作用。因此，代替通常使用的激子复合的图像，激子-极化激元必须用于解释光谱。激子振子强度的合金组合物的影响，从而对激子极化激元色散以及相关的间和intrabranchor散射过程中的散装晶体将被调查，这使得更深入地了解激子极化激元物理散装晶体一般。

The aim of the project is a detailed investigation of the optical properties of copper halides and copper halides-based alloys. Of special interest are the impact of the halide composition on the optical properties, such as the dielectric function and the properties of the underlying optical transitions, as well as the emission and phonon properties. For this purpose, binary compounds as well as ternary and quaternary alloys will be investigated by means of a variety of optical methods, e.g., (spatially-resolved) spectroscopic ellipsometry, (micro) reflectivity, Raman spectroscopy, time- and spatially-resolved photoluminescence spectroscopy and excitation spectroscopy. Due to the large exciton oscillator strength in this material system, a strong light-matter interaction takes place. Thus, instead of the typically used picture of a recombination of excitons, exciton-polaritons have to be used for the interpretation of the optical spectra. The impact of the alloy composition on the exciton oscillator strength and thus on the exciton-polariton dispersion as well as the related inter- and intrabranch scattering processes in bulk crystals will be investigated, which allows a deeper insight into the exciton-polariton physics in bulk crystals in general.