Chromophoric self-assembled nonlinear optical multilayer materials. Synthesis, properties, and structural interconversions of assemblies with rodlike alkynyl chromophores
Citations Over TimeTop 10% of 1993 papers
Abstract
The communication describes an approach to the synthesis of thin-film second-order nonlinear optical (NLO) materials in which self-assembled chromophore-containing multilayer structures are built up on clean glass or quartz surfaces in the repeating reaction sequence p-Cl3Si(CH2)2C6H4CH2Cl (coupling layer), 4-[N,N-bis(3-hydroxypropyl)amino]phenylethynyl-4′-pyridine (chromophore layer), Cl3SiOSiCl2OSiCl3 (capping layer). The multilayer structures have been characterized by optical and X-ray photoelectron spectroscopy, advancing contact angle measurements, and polarized second harmonic generation (SHG) properties. It is found that the initially formed coupling-chromophore monolayer exhibits a rather weak SHG response which increases substantially upon capping with the Si reagent. The proposed structural reorganization of the chromophore dipoles (βzzz direction) to an average orientation more coincident with the surface normal is supported by optical spectroscopy. The square root of the SH intensity scales linearly with the number of chromophore layers up to nine layers. For a single coupling-chromophore layer, [formula omitted] esu at ℏω = 1.17 eV.
Related Papers
- → Synthesis of novel nonlinear optical chromophores with enhanced electro-optic activity by introducing suitable isolation groups into the donor and bridge(2019)44 cited
- → The design and synthesis of nonlinear optical chromophores containing two short chromophores for an enhanced electro-optic activity(2020)12 cited
- → Defeating Tradeoffs for Nonlinear Optical Materials(1996)6 cited
- → Optical Threshold Elements Based on the Excited State Photophysical Properties of Molecular Materials(1987)
- → High performance nonlinear optical chromophores(1995)