All-Optical Reflectance Control Based on Photoinduced Complex Refractive Index Changes in Guided Mode Thin Films Containing Indium or Gallium Phthalocyanines

Abstract

Tetrasubstituted indium or gallium phthalocyanines and their dimers bridged with various ligands were dispersed in a polymer thin film, which was spin-coated on silver thin film vacuum-evaporated on a glass slide. All-optical reflectance control was achieved by complex refractive index changes upon photoexcitation of phthalocyanines by nanosecond laser in such a guided mode geometry. They gave rise in less than ns pulse width, and a few to a few tens of microseconds decay characteristic to the lifetime of the excited triplet state. Repeated and reversible reflectance changes were achieved. Axially bridged phthalocyanine dimers showed almost the same photoresponses as monomers.

Solvent Effect on the Third-Order Nonlinear Optical Properties of α- and β-Tertbutyl Phenoxy-Substituted Tin(IV) Chloride Phthalocyanines

“…A range of important modern devices makes use of nonlinear optical (NLO) materials. Optical computing, optical limiting, and optical communication are some of the modern day applications. − Optimizing the design of third-order NLO materials for a given application depends largely on the understanding of the physical mechanisms responsible for the nonlinear response. Strong nonlinearities in organic molecules are known to usually arise from highly delocalized π-electron systems. , Phthalocyanines (Pcs) are known to possess highly delocalized 18 π-electron systems and can be easily processed into thin films.…”

Conductive Behavior and Morphology of Axially Modified Gallium Phthalocyanine Thin Films onto Indium Tin Oxide Substrates

“…In particular, gallium phthalocyanines (GaPcs) have exhibited interesting non-linear optic (NLO) and optical limit (OL) properties that can be used to prepare optical limit materials [7]- [9]. In order to produce suitable materials for optical applications, gallium phthalocyanines complexes have been deposited as thin films by using spin-coating [10] [11] and vacuum sublimation [8] [12] [13] techniques. It is well known that the deposition technique strongly influences the molecular aggregation and orientation within the film, which in turn modifies most of the properties of the dye layer.…”

Materials and devices for ultrafast all-optical processing

“…All of them employs transient bleaching of NIR absorption at the ground state. We proposed all-optical spatial light modulation and parallel switching based on photoinduced complex refractive index changes in guided mode geometry [9][10][11][12][13][14][15][16][17] . Both transient bleaching and absorption type materials can be used in this system.…”

“…We have been making efforts to develop new molecular photonics materials and devices by making various organized molecular systems and by optically controlling their electronic states as schematically shown in Fig. 1 [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . So far we have achieved photoinduced electrochromism which is color changes due only to the photoinduced electron transfer and reverse reactions, molecular control of the lifetime and wavelength of colored species over extremely wide ranges, amplified fluorescence quenching in LB films, photon-mode super-resolution (PSR) to exceed the diffraction limit of light in optical memory based on transitory photobleaching of phthalocyanine derivatives, ultrafast all-optical twodimensional control of reflectance and parallel optical self-holding switch based on photoinduced complex refractive index changes.…”