Germanium optical properties

Heath J R, Shiang J J and Alivisatos A P 1994 Germanium quantum dots optical properties and synthesis J. Chem. Phys. 101 1607... 

The physical, thermal, and electronic properties of germanium metal are shown in Table 1. Optical properties are given in Table 2. 

Morancho, R., Constant, G., Gallon, C., Boucham, J., Mazerolles, P., and Bernard, C., OMCVD Elaborating and Optical Properties of Germanium Carbon Alloys, Proc. 5th European Conf. on CVD, (J. Carlsson and J. Lindstrom, eds ), pp. 526-532, Univ. of Uppsala, Sweden (1985)... 

In substoichiometric germanium oxides, Ge02 x, the insufficiency of oxygen atoms can result in the formation of oxygen-deficient defects. The most typical of these defects is the so-called E -center (-Ge=) defect, which can also be combined with OV located in its nearest neighborhood. The E -center and the E -OV combination exhibit peculiar optical properties considered in this subsection. 

For stacked junction solar cells, one would like to tailor the optical properties so that the active material in the first junction has a wide band gap, and the active layers in other junctions have progressively narrower band gaps (see Section 8). As mentioned earlier, either carbon or nitrogen alloying can be used to open the optical gap, while alloying with tin or germanium can reduce the optical gap. Representative optical data for undoped a-Si C H and a-Si Ge H films are shown in Fig. 2. 

Rativa, D., de Araujo, R. E., de Araujo, C. B., Gomes, A. S. L., and Kassab, L. R. P. (2007) Femtosecond nonlinear optical properties of lead-germanium oxide amorphous films. Appl. Phys. Lett. 90 231906. 

Another potential application of fully converted polydiacetylenes is based upon their unusual non-linear optical properties. Sauteret et al. found that the third order susceptibilities of TCDU and TS increases by about a factor of 600 upon polymerization and become comparable to those of inorganic semiconductors like GaAs or germanium. This is a consequence of the increase of n-electron delocalization upon polymerization. Polymeric diacetylenes can therefore be used as efficient elements for third harmonic generation. In Ref. this effect has been employed for tripling the frequencies of 1.89 pm and 2.62 pm radiation. 

Tauc, J., Grigorov, R., Vancu, A. Optical properties and electronic structure of amorphous germanium. Phys. Stat. Sol. 15, 627 (1966)... 

Cantin JL, Schoisswohl M, von Bardeleben H-J (1997) EPR characterization of porous silicon and silicon germanium Chapter 14. In Amato G, Delerue C, von Bardeleben H-J (eds) Structural and optical properties of porous silicon nanostructures. Gordon and Breach Science Publishers, Amsterdam... 

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