Abstract
Supramolecular photochemistry is a new type of photochromism that occurs only in low temperature matrices. In a low temperature matrix, such as a frozen liquid or a polymer host, many of the traditional photochromic processes—for example cis–trans isomerization or heterocyclic bond cleavage—do not occur due to steric hindrance of the rigid environment. There are, however, new and far-reaching “photochromic” processes that can be observed at cryogenic temperatures. Spectral holes are sensitive probes in the study of external perturbations and allow the investigation of molecular properties and guest–host interaction. Apart from great importance in fundamental research, very exciting technical applications are possible. A dramatic increase in storage capacity of optical memories is achieved when the dimensions, frequency, and electric field are used in addition to the spatial position as a means for addressing of data bits or stored images. Efforts are underway in order to develop frequency and field multiplexed storage devices for future technologies.
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