Importance of intermolecular interactions in the nonlinear optical properties of poled polymers

Abstract

A series of phenylbithiophene stilbenes and phenyltetraenes were synthesized and their first-order molecular hyperpolarizabilities determined. Optical nonlinearities up to μβo=9300×10−69 C m5/V were measured at 1907 nm. We show that intermolecular interactions have a large influence on the optical nonlinearity of the molecules in solution and in guest-host polymers with polymethylmethacrylate and polyquinoline as the host. We propose the use of a bulky donor group and a side chain perpendicular to the molecule’s conjugate bridge to reduce aggregation. Electro-optic coefficients as high as r33=30 pm/V at 1.55 μm in polymethylmethacrylate with 25 wt % chromophore loading were measured.

Vibronic effects on solvent dependent linear and nonlinear optical properties of push-pull chromophores: Julolidinemalononitrile

“…5,57,72 The linear absorption spectra broaden considerably and often undergo a net red-or blueshift under these conditions, and this effect alone will influence the optical nonlinearity at any frequency. In order to fully understand how these chromophores will behave under devicerelevant conditions, it will be necessary to understand how the bulk susceptibility (2) for a system of interacting chromophores is related to the molecular hyperpolarizability of the isolated molecule.…”

“…In order to fully understand how these chromophores will behave under devicerelevant conditions, it will be necessary to understand how the bulk susceptibility (2) for a system of interacting chromophores is related to the molecular hyperpolarizability of the isolated molecule. 5,57,73 …”

Organic Phenolic Configurationally Locked Polyene Single Crystals for Electro‐optic and Terahertz Wave Applications

“…This can be attributed to intermolecular hydrogen bond formation between the phenolic group of the OH1 molecule and the solvent. [16] This binding is affecting the electron donating strength and results in a change of the wavelength of maximum absorption l max .…”

Hydroxy-Functionalized Bipyridine and Tris(bipyridine)metal Chromophores: Synthesis and Optical Properties

“…This effect has already been observed in other chromophores by Dalton et al, by solution FTIR spectroscopy. [16] In the C 2 group, this intramolecular hydrogen bond results in the formation of a stable five-membered ring and contributes to a decrease in the donor ability of the nitrogen atom. No formation of such a hydrogen bond in the C 4 group occurs, since the resulting seven-membered ring is thermodynamically less favored.…”