Nonlinear absorption reversing between an electroactive ligand and its metal complexes

Abstract

We present the nonlinear absorption investigation of an electroactive ligand and two ruthenium and iron metal complexes under 532 nm, 30 ps laser excitation, by the "open aperture" Z-scan technique. Significant nonlinear optical parameters have in all cases been measured, while the nonlinear attribute has been found to change from saturable to reverse saturable absorption between the initial ligand and its complexes.

Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

“…Therefore, it could be deduced for the TPP(OMe) 4 that a transition from SA to RSA happens as the input peak intensities increase. Such transition behaviors have been observed and reported in various materials, which are usually dependent on molecular structure [32,41], excitation wavelength [42,43], peak intensity [44,45], and solution concentration [35,46,47]. Since the excitation wavelength, peak intensity and solution concentration are same in our experiments, the nonlinear absorption behavior in TPP(OMe) 4 should be attributed to its unique structure.…”

Optical limiting efficiency of an electroactive bis-iminopyridine ligand and its zinc complex

“…In this regard, π-conjugated chromophores reveal good processibility, electronic and optical properties [1][2][3][4] including intrinsic hyperpolarizability of 3-dicyanomethylene-5,5-dimethyl-1-[2-(4-hydroxyphenyl) ethenyl]-cyclohexene nanocrystallites incorporated into the photopolymer matrices with high third order optical properties [5]. The delocalized π-electrons give rise to ultrafast response times and large optical nonlinearity, which makes these materials attractive candidates for optoelectronic and photonic applications in optical computing, logic devices, optical switching and organic solar cells [6][7][8][9]. We were interested in the π-conjugated "Push-pull" organic chromophores containing a tetrathiafulvalene electron donating group and an iminopyridyl accepting fragment that can also act as a coordinating unit.…”

“…The details of the Z-scan technique and the procedure used for the determination of the NLO parameters have been described in details elsewhere [7]. Their nonlinear refractive and absorptive properties were measured and are compared with those of the C 60 fullerene.…”

Novel pendant azobenzene/polymer systems for second harmonic generation and optical data storage

“…[1][2][3][4][5][6] Considering the development of multimedia and electronic communication networks, there is a tremendous need for data storage. Hence intense research activity is ongoing to find optical data storage materials, as well as suitable processes, for surpassing the capacity limits of the currently utilized storage media.…”

“…transition dipole moments, the corresponding oscillator strengths f can be calculated according to relation(4).…”