Active plasmonic model, surface plasmon

The presence of interfaces within a polymer LED can also introduce additional nonradiative decay channels. This is particularly important in proximity to a metal electrode. Excitons which are able to diffuse to the metal surface are liable to be quenched directly by interaction with the metal wave function. This mechanism is therefore active only within a few nanometers of the interface. At larger distances (up to about 100 nm), excited molecules can couple to the surface plasmon excitations in the metal, thus providing a further nonradiative decay channel. The combined effects of changes in the radiative and nonradiative rates in two-layer LED structures have been modelled by Becker et al.,83 who have been able to model the variation in EL efficiency with layer thickness due to changes in the efficiency of exciton decay. 

Evidence for both models exists, and while the action of mtHsp70 remains controversial, most evidence indicates that BiP acts as a ratchet. Using purified proteins in surface plasmon resonance assays, it was shown that the Sec63p J-domain could bind and activate BiP to bind peptide substrates in its immediate vicinity in the presence of ATP. In this manner, BiP could bind to a wide range of substrates, including some that it would not normally bind to on its own (Misselwitz et al, 1998). Such promiscuous binding would be favorable to preprotein translocation in... 

O. J. F. Martin and co-workers [8] for the interacting plasmon resonant nanoparticles. The possible location of a molecular probe is some point between two or more islands on gold surface. We suppose that these points generate so called hot spots [9] on self-aggregated colloids that are exclusively active in SERS. The simple theoretical evaluations based on the field superposition near the dissipative medium are also in good agreement with the distance dependence obtained by us and the model of molecular probe location. 

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