Refractive index and nonlinear optical properties of polyaniline derivatives
Journal
Journal of Polymer Science, Part B: Polymer Physics
Journal Volume
32
Journal Issue
1
Pages
195-200
Date Issued
1994
Author(s)
Abstract
Abstract An investigation of the refractive index and third‐order nonlinear optical susceptibility χ (3) of two polypernigraniline derivatives, poly (4,4'‐diphenylimine methine) (PDPIM) and poly (4,4'‐diphenylimine p‐heptyloxybenzylidene) (PDPIHB) reveals effects of molecular structure on the linear optical and nonlinear optical properties of conjugated polymers. The χ (3) (−3ωω,ω,ω) of PDPIM was found to decrease relative to polypernigraniline, reflecting the observed decrease of the oscillator strength of the 2.2 eV absorption band when a methine carbon replaces one of the nitrogen atoms of pernigraniline repeat unti. The alkoxyphenylene side group substitution at the methine carbon in PDPIHB, however, significantly enhances the nonlinear optical response of PDPIHB while reducing the refractive index compared to PDPIM and polypernigraniline. The present results suggest that structural changes in conjugated polymers can be made in such a way as to enhance the nonlinear optical properties while modulating the linear optical properties. © 1994 John Wiley & Sons, Inc.
Type
journal article