Evaluating the possibility of creating a thermal-radiation detector based on the phenomenon of photoisomerization of organic dyes

Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

“…Optical properties of thin films formed by this dye on the bare dielectric support were thoroughly studied by authors. 14,15 3,3′-Diethylthiacarbocyanine iodide is a monocarbocyanine (MCC) dye. Its molecules consist of two heterocyclic end groups with nitrogen atoms conjugated by the relatively short methine chain (−CHCH−CH=).…”

“…16,17 Despite that, we found that in the presence of silver NPs, laser irradiation leads to the conformational change of MCC molecular layers at a comparatively low threshold. This phenomenon may be used in the ultrafast optical memory devices due to the rapid (∼1 ps) 14 changes of configurations of the molecules.…”

“…As the research subject, we chose 3,3′-diethylthiacarbocyanine iodide, an organic dye with very strong absorption bands in the spectral range of silver NPs absorption. Optical properties of thin films formed by this dye on the bare dielectric support were thoroughly studied by authors. , 3,3′-Diethylthiacarbocyanine iodide is a monocarbocyanine (MCC) dye. Its molecules consist of two heterocyclic end groups with nitrogen atoms conjugated by the relatively short methine chain (−CHCH–CH=).…”

“…The energetic barriers for conformational changes of MCC layers are expected to be rather large because of the rigidness of its short polymethine chain. , Despite that, we found that in the presence of silver NPs, laser irradiation leads to the conformational change of MCC molecular layers at a comparatively low threshold. This phenomenon may be used in the ultrafast optical memory devices due to the rapid (∼1 ps) changes of configurations of the molecules.…”

Reversible and irreversible structural transformations of nanocomponents of molecular layers by resonance photoexcitation or heating

“…This is largely because the stereoisomerization plays the important role in the processes of intramolecular conversion of optical excitation energy [3], participates in the mechanism of vision [4], affects the operation of passive Q-switches and dye lasers, and may be in principle used for data recording [5].…”