Photoassisted Holography in Azo Dye Doped Polymer Films

Abstract

Holographic storage is one of the most important applications in the field of optics, especially for recording and retrieving data, and information storage by interference patterns in photosensitive materials are no exception in this regard. In this work, we give evidence that holograms recorded by interference of two coherent laser beams in azo dye doped polymer films can be controlled by a third incoherent assisting laser beam. We show that light diffraction can be increased or decreased by an assisting beam depending on the respective orientation of the polarizations of the recording and the assisting beams. We also found that photomanipulation of polarization holograms, prepared by polarization modulation, does not depend on the polarization of the assisting beam, whereas, photomanipulation of holograms prepared by intensity modulation strongly depends on the polarization of the assisting beam. Photoselection is shown to play a major role in the photoassisted diffraction process.

Polarization effects in light-tunable Fano resonance in metal-dielectric multilayer structures

“…In these experiments, the pump light was incident normal to the sample surface and no dependence on the pump polarization was observed. These results are somehow surprising, since the DR1 chromophores are strongly polarization sensitive [39]. The photoinduced shift of the Fano resonance is attributed to the change in the refractive index of the DR1-doped PMMA waveguide layer caused by the photoisomerization.…”

Surface Enhanced Visible Absorption of Dye Molecules in the Near-Field of Gold Nanoparticles

“…Gold NPs (Au-NPs) have been used for enhancing photovoltaic properties of dye-sensitized solar cells 28,29 and perovskite solar cells 30 , as well as in photocatalysis and environmental remediation [13][14][15]31,32 , and plasmonic photothermal therapy of cancer 33 as well as applications in imaging, sensing, biology and medicine 20 . Thin films containing photoresponsive units act as transducers that can convert incident light into molecular motion, resulting in numerous applications such as holography and data storage, as well as photomechanics and mass motion and micro-nano machines [34][35][36][37][38][39] , and so on 40,41 . For optically thin films, increasing the absorption results in improved transduction.…”

Современное Состояние Разработки Светочувствительных Сред Для Голографии (Обзор)

“…Исследование молекулярно-диспергированного азо-красителя XXXIII в пленке ПММА показало, что свой-ства поляризационных голограмм, в частности величи-на ДЭ, полученных при записи двумя когерентными пучками, существенно зависят от поляризации третьего некогерентного пучка (рис. 11) [137].…”