Optical-limiting response of rare-earth metallo-phthalocyanine-doped copolymer matrix

Abstract

The nanosecond optical-limiting characteristics (at 532 nm) of some rare-earth metallo-phthalocyanines (Sm(Pc)2, EU(PC)2' and LaPe) doped in a copolymer matrix of poiy(methyl methacrylate) and methyl-2cyanoacrylate have been studied for the first time to our knowledge. The optical-limiting response is attributed to reverse saturable absorption due to excited-state absorption. The performance of LaPc in a copolymer host is studied at different linear transmissions. The laser damage thresholds of all the samples are also reported.

Nonlinear optical response of tetra and mono substituted zinc phthalocyanine complexes

“…7. As previously reported, the linear nature of the graph is a clear indication that RSA is the main mechanism causing optical limiting in the studied samples [50,51]. As earlier stated, the RSA in these complexes is due to the excited-state absorption (with contributions from both the singlet and triplet state.…”

The optical limiting of blue and green ytterbium double-decker phthalocyanines in solution and in poly(acrylic acid) as thin films

“…It is therefore important to verify the existence of RSA at 532 nm, particularly because LnPc 2 complexes have a BV band around this region which is likely to contribute to ground state absorption. To investigate the RSA existence, we follow the previous reported procedure [55], by plotting natural logarithm of I in /I out ratio against the I in À I out difference. If RSA is strongly affected by the other competing processes, the fitting is expected to deviate quite strongly from the linearity.…”

Indium(III) and Gallium(III) phthalocyanines-based nanohybrid materials for optical limiting

“…This gives rise to the phenomenon of Reverse Saturable Absorption (RSA) as a consequence of multiphoton absorption [11,12]. Nitschke et al reported the first study of the NLO properties of Pc nanoparticles fabricated from tBu 4 PcZn, (PhS) 4 PcZn, tBu 4 PcCu and (PhS) 4 PcH 2 [13,14]. The actual particle size, when was on the nanometer scale, was found to be molecule-dependent.…”

“…The significant improvement in the NLO response of the nanoparticles over solutions of the same phthalocyanines was obtainable. As an example, for the molecular and nanoparticle (PhS) 4 PcZn sample, the solution of this sample exhibited the nonlinear absorption coefficient (b I ) z (4.0 AE 0.8) Â 10 À10 cm W À1 while its associated nanoparticle exhibited a b I value approximately 5.3 times larger at…”