Slipped-cofacial J-type phthalocyanine dimers as potential non-linear absorbers for optical limiting applications

Abstract

Phthalocyanine J-type dimers show unusual spectral properties and self-assembly in the solid phase. The optical power limiting effect was theoretically investigated.

A New Way to Predict the Efficiency of Optical Limiters without Providing an Experiment: Processing of TDDFT Calculations for the Case of Pure Two-Photon Absorption

“…The calculated absorption spectra of isolated organic dyes under different electric fields demonstrate significant variation in the spectral region of transparency. The simulated optical response as the “transmittance vs. field strength” relationship shows a tendency toward optical limiting similar to what is usually observed in practice. − To bring theory and practice closer together, primarily, one should compare the oscillation strength of the TDDFT transitions and the absorption coefficient of the dyes in solution or a matrix. Then, one can operate with such macroscopic parameters as linear transmission and optical layer thickness.…”

“…In the experiment, the optical limiting effect is observed as a decrease in transmission on the growth of the radiation power, when the sample is placed at the focus of a collecting lens. , At the same time, it was shown that the optical effect observed in laser experiments can be reproduced using ab initio calculations . For this purpose, TDDFT calculations are performed by perturbing the ground state with electric fields polarized in all Cartesian directions . Thus, the electrical component of laser radiation is associated with a series of electric fields in simulation.…”

Benzoannelated A3B-Phthalocyanines with Diethyleneglycol Substituents: Synthesis and Control of Aggregation

“…[20] On the other hand, aggregation is known to enhance nonlinear optical properties of phthalocyanines improving their efficiency as optical limiters. [21][22][23][24] In the present work we showed how aggregation of benzoannelated phthalocyanines can be controlled by variation of functional groups at distant positions with respect to the tetrapyrrolic core. These results can contribute to elaboration of phthalocyanine-based materials with tuneable properties.…”

Helical Self‐Assembly of Optically Active Glycoconjugated Phthalocyanine J‐Aggregates

“…The aggregation of Pcs, on the other hand, can have an uncontrolled and unforeseeable effect on the photophysical properties and considerably influences these properties as well. For example, absorption, fluorescence quantum yield and photosensitizer activity of Pcs may drastically decrease upon aggregation . In general, aggregation can be divided into two different types (Figure ).…”

“…For example, absorption, fluorescence quantum yield and photosensitizer activity of Pcs may drastically decrease upon aggregation. [2] In general, aggregation can be divided into two different types (Figure 1). On one hand, tetrapyrrol macrocycles can form face to face aggregates with the molecular transition dipole moments connected perpendicular to the line connecting their centres.…”