Third-Order Nonlinear Optical Susceptibilities of Solutions of Some Mesogenic Metallotetraphenylporphyrins by Nanosecond Degenerate Four-Wave Mixing Method

Abstract

The benzene solutions of a mesogenic tetraphenylporphyrin, 5,10,15,20-Tetrakis(4-n-pentadecylphenyl)porphyrin, and its metal complexes (metal: Co, Ni, Cu, Zn, and V = O) were investigated to determine the 3rd-order nonlinear optical susceptibilities χ(3) by nanosecond degenerate four-wave mixing (DFWM) at 532 nm. All solutions of approximately the same concentration ( ≈ 10−5 mol/l) showed χ(3)-values of the same order of magnitude, ≈ 10−11 esu.

Synthesis and Third-Order Optical Nonlinearities of Conjugated Polymer-Bonded Carbon Nanotubes

“…The fluorescence of PmPV/MWNTs and PPA/CNTs was much weaker than that of the parent polymer, caused, as the authors proposed, by absorption, quenching, and scattering from the nanotubes. 40) Similar mechanisms may be applicable to the decrease in the fluorescence intensity in our POTABQ-MWNTs system. An intramolecular photoinduced charge transfer process may be involved in fluorescence quenching, in which the electrons in the excited POTABQ chains are effectively transferred to the nearby shells of the nanotubes throughand pconjugated bonds.…”

Synthesis and phase behaviour of β-octaalkyl porphyrins

“…All chemical shifts are reported in δ (ppm) using the residual 5 proton impurities of the NMR solvent as an internal reference and J values are reported in Hz. Mass spectra EI, FAB and MALDI mass spectra were obtained by the chemistry department at Imperial College London.…”

“…In recent years there has been renewed interest in designing and synthesizing discotic liquid 25 crystals due to their potential application in several fields including charge transport 2 , photoconductivity 3 , optical sensors 4 , nonlinear optics 5 and organic light-emitting diodes 6 .…”

“…Since the discovery of discotic mesogens, 1 a large number of discshaped molecules have been found to exhibit liquid-crystalline phases (columnar and/or nematic mesophases) as a function of temperature. In recent years there has been renewed interest in designing and synthesising discotic liquid crystals due to their potential application in several fields including charge transport, 2 photoconductivity, 3 optical sensors, 4 nonlinear optics 5 and organic light-emitting diodes. 6 Generally speaking, most discotic mesogens have flat or nearly flat central cores surrounded by six or eight (rarely four) long chain substituents.…”

Synthesis, z-scan and degenerate four wave mixing characterization of certain functionalized photosensitive polyesters containing ortho-hydroxyazo chromophores

“…The v (3) value of the samples as measured with DFWM is given in Table 2. The v (3) value of reference CS 2 is taken to be 1.7 Â 10 À12 esu at 532 nm [31]. DFWM and z-scan data shows some slight mismatch in the v (3) .…”