Device structures threshold switch

So far, I have outlined the deployment of our initial research with respect to the applications of liquid crystal PCs. They are described in detail in references [127-130]. Starting from there, the progress of research related to liquid crystal lasers has advanced remarkably. In the early studies, it was necessary to excite samples with large Q-switched pulse lasers, but the research results led to a cmistant improvement of materials and device structures that reduced lasing threshold and improved slope efficiency [131-136]. This made it possible to excite those PCs with semiconductor lasers. Furthermore, it has even come possible to excite with a CW laser also shown in [137]. In addition, control of the lasing wavelengths by modulation of the helical pitch (by temperature and electric field) in the early days of development led to effective refractive index modulation and fast stability control [138]. In 2000 it was quite a surprise that laser actimis occur even in a system containing fluctuation such as liquid crystals, but by now, it can be said that... 

Even physical properties such as temperature can serve as input to molecular YES logic devices producing fluorescence output. These are a subset of luminescent molecular thermometers. Very sensitive thermometers of the YES logic type are acrylamide polymers labeled with benzofurazan-containing fluorophore, 4. ° The fluorescence of the benzofurazan unit drops with increasing solvent polarity, whereas the acrylamide polymer molecules form a low-polarity globular structure at high temperatures. So, the combined system switches on fluorescence as the temperature increases beyond a quite sharp threshold. 

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