Two-photon absorption spectrum in diazoaromatic compounds

3,3′-Benzene-1,4-diylbis[1-(substituted)phenylprop-2-en-1-one] derivatives: A new class of materials for third-order nonlinear optical applications

“…The values r 0 2 of Bischalcones are nearly two orders of magnitude larger than the r 0 2 values of Rhodamine 6G which is 10 À48 -10 À50 cm 4 s/photon [31], and azoaromatic compounds which are of the order (1-6) Â 10 À50 cm 4 s/photon [32] and are also comparable with the recently obtained values in asymmetric Zn(II) porphyrin complexes substituted in the meso or b pyrrolic position by -C@C-C 6 H 4 X moieties (X = NMe 2 and NO 2 ) [4].…”

“…Especially, nonlinear optical materials exhibiting strong two-photon absorption (TPA) are in great demand, due to their applications in three-dimensional fluorescence imaging and multi-photon microscopy, eye and sensor protection, frequencyupconversion lasing, optical signal reshaping and stabilizing fast fluctuations of laser power [1][2][3][4][5]. A wide variety of materials have been investigated for third-order nonlinear optics, among which organic materials are attractive because of their optical and electronic properties which can be tuned and tailored by structural modification.…”

Nonlinear optical characterization of tetraphenylporphyrin in the picosecond regime

“…The population of the S 1 states will always be small due to their fast relaxation time [9]. Finally, the herein reported NLA coefficients when compared to other values found for organic compounds [11] are much larger. Furthermore the effective 2PA cross section values measured in the commercial Pphs are of the same order of magnitude than those reported for porphyrin supramolecules [12].…”

Synthesis and characterization of strongly two photon absorbing and photoswitchable azo molecules

“…These two isomers can be easily interconverted by illumination with light at an appropriate wavelength, reaching a photostationary state where the two isomers are at equilibrium [11]. Although there have been previous studies done on the TPA activity of azo compounds [9] [12], most studies M A N U S C R I P T…”