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Understanding the interactions of the crystalline and the amorphous domains in semi-crystalline polymers, such as HDPE or PVDF, is a subject of ongoing research. Here, we apply terahertz time-domain spectroscopy to study the impact of the glass transition taking place in the amorphous phase on lattice modes associated with the crystalline domains.
Decreasing the temperature leads to a blue shift of the B1u lattice mode in different types of polyethylene, which can be observed using terahertz time-domain spectroscopy. Moreover, the frequency shift reveals the glass transition of high-density polyethylene due to the semi-crystalline nature in this polymer. In addition, morphological factors on the B1u lattice mode of LDPE, LLDPE, and HDPE are...
Ga(NAsP) multi quantum well heterostructures were grown pseudomorphically on exactly oriented (001) silicon substrates without the formation of misfit dislocations. Optical pumped lasing operation was observed at temperatures up to 125 K.
Nowadays silicon photonics gains more and more interest especially for the future architecture of Si based optoelectronic integrated circuits (OEI C). OEIC building blocks such a s modulators, detectors as well as light wave guides have been demonstrated in a down-scalable process technology. However, a commercial solution for the monolithic integration of long-term stable laser diodes has not been...
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