Optical limiting behavior of octa-decyloxy metallo-phthalocyanines

Abstract

Comparison between the optical limiting behavior of chloroaluminum phthalocyanine and a cyanine dyeOne of the key issues involved in the development of passive optical power limiters is the search for appropriate materials that show effective reverse saturable absorption. Metallo-phthalocyanines seem to be good candidates for such applications because of their high optical nonlinearity and their unique electronic absorption characteristics. A series of 1,4,8,11,15,18,22,25-octa-decyloxy metallo-phthalocyanines containing palladium, nickel, cobalt, copper, and zinc as central metal atoms were characterized for their nonlinear absorptive properties to evaluate their suitability to function as reverse saturable absorbers. Nonlinear transmission measurements were analyzed in terms of a five-state model and a simple model based on the effective excited-state absorption cross sections without ascribing their origin to the states involved. Optical limiting thresholds were also estimated and compared with the absorption cross sections.

Alkynyl substituted phthalocyanine derivatives as targets for optical limiting

“…10,11 On the other hand, the effect of the peripheral substituents is less clear. [13][14][15] Determining the rationale of the influence of the electronic interactions between macrocycles on the nonlinear absorption of Pc-based systems is also an appealing task that has not been addressed previously. Recently, we have prepared homo-and heterodimetallic ethynyl-and butadiynyl-bridged bisphthalocyaninato complexes using metal-mediated coupling methodologies.…”

Ether-linked porphyrin covalent organic framework with broadband optical switch

“…Furthermore, the femtosecond transient absorption spectrum of COF-Pors in DMF (λ ex = 400 nm) showed two main transient absorption bands at ~ 480 and 700 nm after the laser pulse irradiation ( Figures S12 A and S12B), suggesting the excited-state absorption in the material system. Like porphyrins and phthalocyanines, the enhanced EPR signal and the transient absorption bands can be assigned to the strong excited-state absorption of COF-Pors under laser illumination ( Sanghadasa et al., 2001 ; Chen et al., 2005 ). From the time profile of the excited-state absorption band at 700 nm, the excited-state lifetime of COF-Pors is estimated as about 460 ps ( Figure S12 C).…”

Nonlinear absorption study in four and five energy level systems

“…The spectroscopic properties of five level non-cascade systems can be measured by independently exciting the material with CW or nano-second laser and low repetition rate ultra-short laser pulses in the SBT. As explained theoretically in this paper, experimentally one can modulate the transmittance curve by using optical materials in the presence of different dopants, hosts and in different states [23][24][25][26].…”